The rescue that I had a while ago Little Grey benifited so much from being around other cats. When I fostered her she had her own room because I didn't want to stress out my cats or especially my roommates cat who is one of those cats that wants to be alone. Well when Little Grey lived here she would never come out from under the bed, I would sit in the room for hours and talk to her and she never came out. But when she went to her new home where there were 3 cats for her to play with she only hid for an hour, then she made friends with one of the cats and now she is super social and runs around the new house like the owns the place.