This poor young woman doesn't have a Mom. She has a woman who gave birth to her.
I hope this experience will make her stronger, and thank God she has a relative who cares enough to take her in.
As for the "mom", well, what goes around, comes around, eventually.
I know a guy whose two daughters moved in with him after the ex-wife's lover made a pass at the older one --- when she informed her mother about what happened, the mother blamed her for trying to seduce her lover and told her to leave. Leave a house that her own father had bought but which now had another man living in it after the wife won the house in the divorce.