In fact, back in the unlimited alias days I had around 200 of them. But if you're going to ask for advice like this and expect us to just accept that you're "an established hobbyist with a good track record" you may have gone a bridge too far.
Sorry.

If someone I know well and trust, knows her, and who raves about her, for example, I would consider her. But speaking very generally, a "very hot" girl with a "very low rate" with "unremarkable" reviews are typically tell tale signs she may be TGTBT and thus I wouldn't see her.

are often hot, and actively advertise, but rarely get good reviews for obvious reasons.  On the other hand, providers are often not as hot as the shopped photos which made their ads more appealing, leading to reality being disappointing, which in turn leads to lukewarm reviews.

Hot and low rates and advertising on major platforms doesn't add up.
I'd drill deeper into her two reviews and evaluate whether or not the reviewers are credible.  
If she'd on X, I'd examine who she follows, who she retreats, who follows her.
Since she's not established,  I wouldn't offer PII for screening or submit a booking deposit.

If you're so established where are your many reviews that “established” guys have. You’re suspicious if you ask me.

here is, what does “unremarkable” mean?  Could you be more specific?

 
Some of the best providers i know have had a few “unremarkable” reviews, by guys who always seem to write such reviews. I know other providers who got “unremarkable” reviews when they started out, but they upped their games or added to their menus (eg massage provider added FS) and their scores improved significantly.  

 
Also, I assume you’ve checked this providers pics to see if they’re stolen, as an experienced monger would do.  

 
Unless we know more about what her reviews say, and why, we’re shooting in the dark.

I found myself in a vey similar predicament just a couple months ago. The provider was near me and had advertised on a site that I have used many times. Almost exclusively other than TER. I was unable to find ANY reviews for her name and/or phone number. I had already sent her a text. The conversation went pretty well so I was intrigued but, due to no reviews. I held off.
Then I finally found a review of her with a different name and phone number but it was the exact same pictures. The review was a year old but very good. Area matched up but that was all. Now I'm really suspicious ....and intrigued!!
I ended up rolling the dice and visiting her. And boy did it pay off huge! She was fantastic!! I've still not been able to leave a review becase the name and number doesn't match up to the only ad I can find. TER Would not approve it. The ad that I answered has expired in is no longer visible.
I think it's honestly just a 50/50 shot. One I normally don't take. In my case it worked out but you just never know. I guess it's best to err on the side of caution.

I fit that description precisely.

YOU know there isn't exactly a hand book or Teusday Morning meetings for us providers. I have no idea what I'm doing 1/2 yhe time. However I'm very good at the action and connect with people well. I have rarely seen a client who didn't want a second or 3rd visit.  I am flexxible accomidating and very much put my clientd wants and needs first and always aim for regulars.    Some if the lower level  sites flag our ads regularly just to be giant pains and every time we basically start from scratch with reviews. And also alot of those guys don't leave reviews for whatever reasons . I also don't really understand how to advertise properly with some websites and haven't really realized my full potential as far as marketing platforms.  I think it's just case by case. Some of us just have a hard time with reviews or lack there of. We all gotta start somewhere.