She is used to relying on the other cats for information as to safety. Now she has to sort it all out for herself.
I would say, you have allowed her too much area too soon. Do you have a room you can confine her in -- one with no bed for her to hide out of reach? You want to be able to go in and visit with her, not have her out of sight. That would be the best option.
If not, then work out something where she has limited area. When you are with her, use one of those cat toys on a string, dangle and drag it across the floor for her to play. Get her mind OFF 'da big human in da room' and on fun. She will start to associate you with fun. Try to play with her multiple times daily.
Remember to remove the toy when no one is available to supervise. Those toys are hazardous to cats, and should not be left out where the cat can get to it.
Let her have a catnip mouse in the room she is in.
You need to work on building up her feelings of confidence and safety.
I also suggest you communicate with the foster parent or, if you have no way to reach them directly, then the rescue.
Hope this helps!
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