My mom freaks out and then acts like nothing happened? Why she does it?

My mom often yells at me for hours, usually through my closed door, without any apology or acknowledgment afterward. She then acts friendly, as if nothing happened. It confuses me because she’ll be nice right after, leaving me wondering if I should just ignore it. I left for work early today to avoid the yelling, and when she called, she only remarked on me leaving early, completely ignoring the earlier argument. It makes me feel a bit crazy.

My mom freaks out and then acts like nothing happened? Why she does it?
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