i can tell you its a fake photo .... if you are new i would stick with established ladies first until you get the know the hobbies idiosyncrasies

Yeah, the go to website and create account thing is definitely a scam. Also, doing a reverse image search on her pics showed a Facebook profile with her pics and more. Says shes French

The other half You lost me after tube.

This is all sorts of suspicious. It's certainly bait-and-switch at best, or a setup.

I've never been to Nashville, but those prices are incredibly low for the specific services she advertises. Also, the purported TER review is shown in a way that it could be any provider named Marcy in any city in the world. My best guess is that the ad is a scam.

Please go to the newbie board and read and ask questions there as GaG told you earlier. You need help!

To go point by point to some of your comments, and call out the red flags:

“She is very attractive. I like her pictures.”
They are pictures of someone attractive but I seriously doubt the person behind the ad looks anything like the pictures. It’s probably some guy in Nigeria. you can use Google reverse image search and tineye to check if the pictures were stolen off some other internet site. Those searches don’t always delicer results but lots of tines you can find out if the photos were stolen, and from what site.

“Website is professional looking”  
Not at all. That is a very amateur looking cookie cutter, do it yourself website.  
Legit providers can have amateur websites, and scammers can have professional looking websites, so that in itself would not be a red flag to me, but along with the other red flags, she is definitely a no go. However, you are the one who said her website is professional looking, so if you are going to use a professional vs non professional looking website as one of your red flags, (and many mongers do), then you really should learn what a professional looking website looks like!

“It even has reviews, one from TER.”
 Don’t trust “reviews” posted on a providers own web page, unless you can find those reviews on legitimate reviews sites. The review from TER is just a screenshot of the general details of a generic review from some provider named Marcy. There is no provider ID number, no juicy details, no ratings, and no cost for service. By the way, I searched for reviews for “Marcy” in Tennessee, and there were zero returns, so whoever she stole that review from is not even in Tennessee.  

“Her rates are very appealing,”
Her rates are ridiculously low! $100 for an hour? That’s a huge red flag. Run far away.  
Legit providers in the USA do not charge rates that low. If you were in a foreign country, those rates for an attractive provider could be legit. In the USA, maybe if you were looking for a crack whore on the streets, the prices might be right, but no legit provider with an internet presence is charging that low.  

“She is very specific about the services she offers” Another big red flag.
Most legit providers will not be specific about the services they offer. That’s what reviews are for.  

The Sarah vs Marcy name thing is another red flag.  

The directing you to a website asking you for money. Giant red flag. And apparently one you have fallen for before! You must learn from your mistakes, grasshopper! Don’t keep falling for the same shit 💩!  I guess you learned a little since you used a prepaid card this time instead of giving your credit card info for someone to continuously charge, but why even do that? Why even waste the 30 bucks and your time to go buy the pre paid card? Don’t send deposits! Don’t pre-pay for supposed verifications or screening!  

”What do you guys think? You have a lot more experience with this sort of thing than I do.”
I think that ad is a total 100% scam and you got taken yet again. I think you need to read the newbie board and ask lots of questions, and do a lot more research before diving deeper into this hobby. I think you need to read reviews and see only well reviewed providers. Good luck

As soon as I saw this in your post:  
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"The YouTube video tells you to spend $25 on a website as a deposit to get 200 credits looking at pictures of her and other women. "
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I know its a scam.  If you are foolish and spend the $25, it will not end well for you.  
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Other tells:  
1. The "Stacy" issue aside, she does not even know how to spell her own name; at the top it's "Marce,": but in the video on the right side, it's "Marcy".  
2. The comments (reviews) that SHE selected to list on her site show she's consistently late to appts (20 mins) and that she may have hidden or non-disclosed "don't rules".  That's just bad juju from a provider who is trying to "gain new clients" Note: Any provider can have any rule she wants. That's her inviolable right. But I wonder how "GFE-ish" she is when she's late and then starts with "don't do that..."  
3. Last review was 11/2008. The review from the pic on her site was July, 2008 and states CBJ and other "don'ts".  
4. TER ID: 110720 - take a look. Low scores in the 5-7 for appearance and 3 to 8 for performance range. Please read some of them.  
5. She is (or was in 2008) based in Chicago. Not sure where you are...  
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Your options:  
1. TOFTT and book her 15 min $50 session and report back here.  
2. Walk away with your cash and use it as a tip for a much better provider, and report back here.  
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Life is good.
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The Cat

As soon as I saw the ad was for "Marce" and the TER review was "Marcy", I was done.  After that, nothing else matters for me.  Its an automatic pass.

So I will give you sound advice instead.

First read and post on the newbie board. There are tons of bad actors in this game. Look my first time doing this a lady stole $2000 from me because I was stupid. Don't pull a scoed. Learn from others how to do this safely. There are tons of honest good women in this game, But there are tons of scams, cops, and worse out there. So learn a thing or two from the newbie board before wasting money on scams like this. Read everything in the self help section. It is invaluable information.

https://www.theeroticreview.com/discussion-boards/newbie---faq-33/ters-instruction-manual-75528?Page=1

Second if things look to good to be true 99 out of a 100 it is. Always and I mean always think with you big head when looking to make the little one happy. You little head and the big one  will both be much, much happier.

Third do your homework on each lady you wish to see before you contact her. This means getting VIP and actually reading her reviews. If approached right PMing people who seen her can give additional information. Good number scores don't always tell the whole story but more than a few bad ones do. Any score below a 6 need looking into. But a 10 doesn't always mean everything was great. Score manipulation is a thing.

Forth don't pay a deposit on dates shorter than two hours,  to look at photo or join a provider's site, ever. Yes some legit ladies ask for them but so do many of the scammers. It seem you met a few already. See you OP for instance. A clear scam.

Lastly take it slow. There is great experiences to be had. Great ladies to meet. But there is lots to learn to be safe. Go learn how to screen on the newbie board. Learn how to put a lady at ease so your date goes well there too. Look at ads and reviews to learn the norms of your area for prices. Then and only then book that date.