Just curious - is there any other cats around? Sometimes they seem to learn from each other. I had Meka for 5 months and then got Max 2 months ago and they are both picking up habits from each other. If there isn't another cat maybe another cat would help - one that is friendly to humans and older. Maybe even a male - male and female seem to get along better then female to female if older (territory thing) - at least so they say. Just an idea. It does sound like she was feral when you got her.

Another idea - and I don't know if this is a good one or not - but go to where she is hiding and sit real slow and don't threaten her in any way but just sit there and talk to her in a nice calm voice for a few minutes - and keep this up everyday a few times a day and maybe bring treats like tuna fish with you and see if she will come out. I'd not let her have it if she doesn't come out. Just sit it in front of you while you are there and take it with you when you leave and maybe after a few days she will want it enough to come out.

Just ideas - Debbie