Why she has became like this?

A few months ago (back in late July/early August) my mom has send me somewhere else to live (she rented a room for me in a home I’ve stayed here for about 4 months) and I recently moved back with her a few days ago, and I’ve noticed that she has became toxic she controlling demanding abusive towards me she even hit me once and I started bleeding and she insults me, she puts me down, she wasn’t like that before in our old house, why she has became like that all of sudden?

Why she has became like this?
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