How lucky for the sweet one that you took her in, and have had her to the vet!

I know a few on here have tried the Feliway, most don't like the plug in one, and say it doesn't work too well. Two people made a sort of "sleeve" for a cat collar, and spray Feliway on that, then put it on the collar. Feliway should NEVER be sprayed right on the cat, but this keeps it close to the cat. So that is something to consider.

Has she shown any interest in cat toys? Tried catnip on a toy? I have one cat who cries unless he has a toy mouse to carry around with him -- and it better be the RIGHT toy mouse! I buy them 6 at a time, as he tends to drop it and forget where he left it. Again, just something to try out.

Two weeks is a short time for cats to adjust, so that is likely the issue.

Let us know what you try, and what works and what doesn't.