Okay, you've gone through a list of reviews and jotted down some possibilities.  Then something happens and you get derailed from your mission.  Next thing you know, it's been a month or two and that old list is still sitting there waiting to be explored.  But the ladies on it haven't posted anything in a while, so how long can you wait before you call, txt, or e-mail a provider who hasn't had any recent posts but has plenty of reviews from months ago? How often do these gals just dissapear?

Just send e-mails (or contact via the provider's preferred method) and wait. If you get no responses, then oh, well. Move on. You won't EVER find out if you don't try, though.

and also that a lady who has been around long enough will develop a repeat clientele.

Between these two factors, it is entirely possible for a well reviewed lady to have had no reviews in months and yet still be providing on a regular basis.

I get reviewed about a dozen times a yr. Not every month. Not all hobbyists are active on Ter even the ones that are don't all write reviews. Some Ladies have asked Not to be reviewed also. I go through periods where I would prefer not to be reviewed, has nothing to do with business but its a preference so my clients honor that.
I see mostly regulars so its the same repeat clients and I work on a reg basis.
As long as her website is still in place and her reviews are still up and active, I'd send an email. You don't see all thats going on all the time.

If you don't get a response move on. As previous post have mention, life goes on. There's tons of reasons why a lady may look inactive when she isn't. Sweetnicole post is just one of many examples.

A month or 2 is nothing.  Check to see if her reviews are still up & her web site.  If providers pause their business for personal reasons, they request the complete profile not be displayed.  Likewise a site can be taken down.  
If they are still up, the send a message & proceed.  If no response, then you'll know.
skb

Personally I think its always ok to go ahead and email the girl. Calling or texting may not be a good idea incase she is out of business now. but I always like getting responses from interested guys I dont see why any girl wouldnt want to possibly have another appointment scheduled or atleast hear that a guy is thinking about her sexy ass! lol good luck

One thing you need to know in this industry is girls come and go as often as Westin Hotels change bed sheets, which is daily. I tried contacting a provider who posted 4 days ago. Her number is now disconnected.

Get the girl while she is available. Some girls realize FAST, this is not for them and they are not cut out for it.