My gf and i got ourselves 2 cats (mother and daughter) who had been living in terrible circumstances. The daughter has evolved to a point where she plays with us and plays herself with us around. Still, she won't allow us within 5 feet. She's comfortable with us being in the same room, but only to a certain point.
The mother is something else. She has been hiding under the closet or in the litter box since then, only coming out when we are asleep or when she's really hungry. There were points we thought she had a breakthrough, but those corner stones were lost very quickly. When we try to give her treats or play with her, she reacts very apathetically, not even smelling the food or looking at the toy. When she enters a room where we are present and look at her (even briefly), she's gone again. To be honest, we have no clue anymore what to do...