She admits she's wrong because she discouraged her daughter from talking to her in the moment, not because "Who the fuck acts like this in the first place? To her husband, no less!"
I knew someone already spoiled that they would be together at the end, but I was interested in what way the author would force them to be together. And I see the answer: just make the teacher a straight-up villain, and by beating said villain, they will make up.
Bravo, author. It's not like you made your FMC a selfish bitch who herself destroyed the mind of her daughter and husband, and only then went to the teacher when she needed assurance of the correctness of her actions.
Moreover, she never actually did something out of love for another person, not even for her daughter. All her actions were either something she wanted to do or what she thought was the right way to act as a parent (because she considers herself a good parent). She is portrayed in this manga as a straight-up psychopath (the main problem with people with psychopathic disorder is a complete lack of empathy, which is what we see here).