I'm really in need of some advice. We adopted a 1yr old Maine Coon cross from a friend of ours. It used to belong to their mum but due to mental health reasons she wasn't properly socialised as a kitten. Has been in a house with 5 other cats and two people so has been around others. We were told that she's a bit shy but would probably come out of her shell when there weren't other cats around as apparently she was affectionate when on her own.
So we knew it wouldn't be totally straightforward. But I've never known a cat like it. Seems to totally disdain humans. Doesn't want to be petted. Totally not interested in food. So dreamies etc are out. Doesn't play, isn't interested in toys or laser pointers or anything. Had partial success with a catnip banana but that's the only thing she will interact with. Ignores the cat igloos, cat tree and other things we've bought so she could hide, scratch etc. Prefers to hide behind the TV stand.
Had to take her to the vets to be microchipped. Prior to this she was beginning to settle in a bit, ignoring us but would eat, groom and generally seemed to be settling in.
After coming home from the vets she's back to hiding in the smallest spaces possible and has now started hissing and growling at us.
I know it takes time but it seems such a shame that it appears that all our work has been undone and we're back to (or further back than) square one.
Does anyone have any advice on dealing with a very unsettled and badly socialised one year old?