She is probably not crazy, just as you mentioned she is a feral and so very, very frightened. Do you have a basement where maybe she could feel safer? Is she spayed and everything, so you could see if there's a barn somewhere near where she could be a barn cat? My sister-in-law once rescued a feral, and had to keep him quarantined in the basement for many months, as he was badly injured, which is why she finally trapped him to get the wound taken care of. He lived in a large cage in the basement, with food and water and places to hide, but it took weeks before he would even appear if anyone but Gail - his rescuer - was in the room.