As far as booking someone you haven't seen before, how recent does she have to have a review? I was thinking about seeing a lady but she hasn't had a new review for over three or four months. Do spans like this make you weary of trouble or is it just clients that don't review.

If she had multiple reviews, but just none lately...wouldn't bother me at all.

You don't know until you try. I hooked up with an ATF a full year after she left the business. It was totally worth the effort.

a problem especially if she had a few prior reviews.  Some get to the point where
they don't have to advertise OR have reviews for quite some time.  If it's
someone you're interested in, I'd get in touch with her and ask.

She might have been taking a break or not seeing new clients.  You can always PM some of her most recent reviewers and see what kind of response you get.