As has been stated, this is (most likely) a 28 day issue. Most rescues, particularly if they've been kept at the Center, need continual reassurance that their new situation isn't temporary - that they aren't going to be returned at any moment. Once puss feels safely established then settled routines shall follow. Sometimes you just have to be tough - one of our previous cats loved to be with us, at all times, and so we tried free-running. I eventually palled at being awoken, at 04:45 every morning, by puss getting up on the bed and sitting on my chest, purring loudly and kneading through the duvet...('where's my breakfast?...').