Anyone know what happened to Vallery/Sarah?  Saw her a number of times and now she seems to have disappeared

You do not contribute reviews. You have not even reviewed this provider.
You have no displayed white lists, not even from her.
And now, you want help finding her?

As others have said in similar circumstances.
Move on.
If she wants to be found, she will make it happen

I need  to  comment  on this  reviews  BS. I am  tired  of this kind of comment. There  are many good  reasons that some hobbyists don't do reviews. Some of us  just are  not comfortable  doing it. Some  of us are  just  not good at it. More  importantly  some of us want  to be a little  more UTR.
None of these  reasons make us any  less reliable  or legitimate

You should have become FB friends with her so you can keep up, Seriously most that leave or disappear for a while dont feel any obligation to tell anyone but it doesn't  hurt to ask. Sometimes some know more than others

people respond to people they know.

Many kinds of people are on this board.  Friends, stalkers, pimps, spouses, LE, old clients, etc.
Why should anybody say anything to the OP without knowing a thing about him/her?  There is no real evidence that the OP is "reliable or legitimate" although he/she may be.
As least in your case, you have a significant record of discussions that gives some idea of how you relate to all this.

Talking to the OP is not prudent

I accept  your point