Oh I feel so bad for you all, Charlotte. Half of me wanted to say 'don't bother loving her, smack her in the teeth', especially when you say she kicked your mum. Unbelievable. But my daughter (DD2, the one I had trouble with) punched me and pushed me over too. DD1 then punched her in the side of the head for punching me. It sounds sick, but we do tease her about it now, but at the time it was truly frightening and so upsetting to be treated like that. So many people just said to me 'send her to live with X,Y,Z', but how can you when it's your daughter, and she CLEARLY needs help, not rejection.
Don't worry about 'too much information', I like a good read You know, lack of self care is a classic sign of depression, too, but there's little you can do if she won't go to the doctor. It's so frustrating isn't it, because they don't seem to want to get better, they seem to like hating you.
Do you feel your mum always connected with you better? I always connected with my eldest daughter better than DD2. I had pnd and found it difficult to bond with her, and it didn't help that she wouldn't look me in the eye til she was about 2 months old. I always felt very guilty about this and have always denied her 'you love dd1 more than me' accusations. I don't think I loved DD more, I would hope not, but she was just easier to cope with. Different temperament, I suppose. Anyway, I don't know why I told you that, it's just a thought that I had. She may detect a closeness between you and your mum that she no longer hopes to penetrate, so instead justs satisfies herself with disrupting it, maybe?