Bonnie may not have been feral. As I know the story she was an outside cat ( maybe a drop off, maybe born there) at a home where 2 elderly people tried their best to feed the cats (many cats). but it was getting out of their control and the rescue organization stepped in to help. Bonnie was brave enough to enter the home of this elderly couple, so she had potential. but she was used to the run of the outdoors so the confinement of one room was hard for her to handle.