my 1st gfe is scheduled in march. the provider had solid enough reviews. but now the reviews and profile are gone. anybody?

Hard to say.  Perhaps she got banned from TER for some reason or decided to leave the business and ask that her reviews were taken down (if that's even possible).

i sent her an email, so far, no reply. will be visiting vegas on march 10th. am starting my research over. thanks

Delisting can be invluntary if the provider is caught cheating...  reviews coming from her computer or the same ISP address.  If banned for this reason, they can not get their reviews back up.

Sometimes a provider voluntarily asks for her profile & reviews to be taken down for personal reasons.  (In a relationship, being outted, legal problems, child custody cases, etc.)  Providers generally try to keep their private life separate & you may not get an answer.  

If the provider does not answer your messages, you have no choice but to move on.
skb