Question about "The Uninvited"? *WARNING* Spoilers!!!?

Okay, so here's what happened. Rachel Summers killed Anna's mom, but they called to the nurse place and they had no records of a Rachel Summer's. So then she thought that she was Mildred Kemp because of the beads, which Rachel took care of the kids and that's when Mildred gave them to her. Mildred was the person in the mental hospital rooming with Anna, and she didn't know that. Her sister was really dead becuase she killed her by leaving the gas thing running and knocking the candle off of the table, and Rachel really changed her name becuase of a crazy boyfriend. Matt was coming to meet her but he died becuase Rachel didn't want him telling her that she killed the mom, so she made a scheme and killed her. Rachel was going to kill Anna because she knew the secret, but really "Alex" killed Rachel then Alex was really dead, and it turns out Anna killed her. Anna goes to the mental place again, and the creepy room-mate girl says, welcome home, holding the pearls, and closes the door, it says Mildred Kemp.