She's not human. She won't ever be, and for a long time I didn't believe her. But she has changed, just not in the way a human would, by seeing that what she did was morally wrong. She loves Sam, enough that she gave up evil to be with him. And Sam chose her, he married her. So she's family now. I don't think she'll hurt anyone where you are. She's been hurt recently herself.
You don't have to be her.
Do you know to lay down lines of salt around entrances?