my daughter is acting like a wolf help what do i do

I think my daughter is slowly losing her mind. She's 19, recently quit her job, and is acting very inappropriate.

First off, before all this, she got ok grades. A's B's and C's, was in plenty clubs, had friends over, went to friends, she did her chores, had boyfriends, when she graduated, she didn't want to go to college which was fine since she got a job the summer she graduated. She was a pretty good child and I thought I raised her well.

Year later, she starts acting weird, staying up all night, becoming lazy, won't cut her hair eventually she quits her job, then sleeps for about 2 whole days only getting up to get food or pee. On the third day, she started skipping baths, I told her about it and she told me she'd take in morning, but doesn't. In which I gave her the women speech, telling her basically she shouldn't do things like this.

Skipping ahead about 1 month. She let her hair grow out till it was too her thighs, I told her to cut it, this is my hair, I told her she's in my house, in which she responded that she was not property in this house, she is a living being. About a week later, she stopped combing her hair, she even made two buns that look like animal ears on her head, her hair still to her thighs.

And skipping to the big problem
Reason I made this

Now, she has stopped wearing clothing, I ask her what in the hell is she doing, she responds, "I'm returning to my animal self" and I tell her she ain't an animal and she says we are mammals so technically we are and it only gets worse from there, there is a guy in this house, her step father, so she should not be walking around naked like that, he thinks she needs psychological help, but I doubt there's something like that wrong with her.

Her hair is long enough to cover her butt and occasionally her breast, not that she cares, but I, do not like it. She won't get that, this is my house and it doesn't matter if she's 19. I had to hose her off outside and tell her to clean herself with a sponge because she was starting to smell. I tell her that this isn't right she was so normal last year, what happened, she doesn't have a job or do chores, then that her stepfather was cutting the front yard. So I look outside later she's cutting the back butt naked. In which I just got so upset. This needs to stop.

I haven't mentioned her sister because she's too young, she actually believes her older sister when she says she's a wolf and asks to feed her, ride her older sister while she crawls around the house, pet her. She's being a bad role model.

I don't know what to do, she won't see the docter, she won't see a therapist. And the thing is, she doesn't argue at me or b**** at me, when I tell her to put clothes on, take a bath, get a hair cut, wipe down there again; all she says is, I'm a wolf mother, wolves don't do that, I tell her she is not, It's just who I am. She makes it hard to make her do something from her nice sounding innocent responses...

I just feel like she's going to be in my house till she's 30 doing the same thing. I won't kick her out because I feel like she'll try to live or worse with a pack of wolves. Even when we have people over I have to beg her to wear something, even if it's a long shirt, which she will wear, but takes it off as soon as they leave. So she has common sense, but... I also think she doesn't smell too bad, she has an Oder, but it smells, more like an animal would, how she did it, I don't know, but the fact that I smell her, is too much. She's stopped walking around the house naked so much an started staying in her room watching cartoons or anime cartoons, whatever she calls it. But I still can't take this.

I'm sorry this was so long, I had a lot to get off my chest, I just don't know what to do with her anymore. Please help.