I found an ad for a lady I'd LOVE to see, and the good news is she's got a lot of good TER reviews.

However, they all date back to 2008 or earlier, and seem to mostly be from a city on the other coast.  Could LE takeover the identity of a retired provider, or am I just being paranoid?

Also, what's the protocol for determining the donation if it's not in the ad & the provider doesn't have a website?

I would think that if she doesn't have a review for two years, she must be retired, or somehow not that active.

The lack of a listed donation is always a problem, so for that reason alone, I would pass on this provider.

LE might omit the donation info to lure a person into asking on a recorded phone call, thus obtaining high quality evidence for a bust.

remember that this is only a short interval in time, not a LTR you are interviewing.   With such a long gap in reviews, she may have been retired, in a relationship, or otherwise unavailable.  
I know of a couple of providers in my area with this exact circumstance.   One I had looked at before she dropped out of sight, resumed work with the same pictures.   Another co-ed using her pictures from when she was college age...  now 5 years out of date.
How did you determine that this was the same provider from the other coast?   Asking questions is not discreet but you need the questions answered before booking a meeting.
Why such a long lag in reviews?
Are the pictures current?
What is the requested donation?  (It makes a world of difference if she expects 250 an hour or 1000!)
While on the subject of pictures, I am always suspicious of just a couple of pictures used over & over in ads.  I want to see several pictures from different angles.

I would suggest putting this one asside for now.  Circle back when you have more experience in the hobby.  
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I met two providers that were like that. They both took like a year off so they had old reviews from 2008, and early 2009.

First thing you wanna do is know what site you're on. If it's a craiglist or backpage ad with reviews that old I would pass. But if it's eros or one of eros VIP members I would go for it. With eros ads cost between 150 into the low to mid 200's to post. Craigslist is free, and BP cost 3.00 an ad to post.

LE might spend 3 bucks to catch a few johns, but not 200 bucks. On eros the girls also have to use their personal info to post on there. So anyone on that site is 97% percent legit.

I'd only question how they look now, if it were pics, from 2008 or 2007.  

It was a provider I knew back in 2008, and she retired, but a few months ago a ad on BP with her pics, and a different number were up. I could the number, and I knew it was a different girl on the other based on how I remember the real providers accent was.