Need help with this Anime movie?

Ok i only remember bits and pieces. Its about this girl who gets stuck in this spirit world. Her parents turn into pigs after eating the spirit food. She then gets help from this boy who is really the river spirit. The same river she fell into when she was younger. Anyhow. She gets hired to work in a bath house that is run by an evil witch with a fat baby. The witch has a twin sister who is good and helps her. The evil witch then gives the girl a new name but the boy tells her not to forget her real name because if she does she'll never be able to return to the real world....theres a bunch of characters. The three rolling heads, the old spiders guy, the weird black mime looking spirit who eats everyone in the bath house. I cant think of the name for the life of me. Help?