There could be a lot of reasons that are totally legitimate for her to do that.  There's a well-regarded lady that I know of in the DC/Baltimore area who had to do that because of a nasty stalker, and I've heard reports of divorce or custody cases making the revisions necessary.

Then again, it might be a bait-and-switch artist who is trying to avoid bad publicity attached to her old persona.  You just never know.  I'd try making contact with the previous reviewers if possible, and seeing if they have anything to say on the issue.  You might also try posting to the "regional board" for your area and asking for "411".

In short, it's definitely a yellow flag, and has the potential to be a red flag, but circumstances may be such that the situation is OK.

reinvent herself and got a new site, new name and switched from FBSM/SMBD to GFE.

Under those circumstances, it is legitimate, but sometimes, it is done to escape the spectre of bad reviews, so you have to be at least a bit wary.

Also, some providers have to do it to escape stalkers and similar dangers.

of several reasons, primary according to a couple of ladies I have known are:
1.  Close call with LE
2.  Personal security
3.  Retired and of course, changed mind.
4.  Just a newer name, refresh.
And then there is the one due to poor service and ID change hopefully throws off newer clients.

For a totally different reason and actually was lucky to have my reviews merged.  It was a hard process but worth it.  I was working for a "madam" when I went by Hailey and she didn't want me to take the name when I left, so now I am Tasha and am better than ever!!!