
While I can feel for your end, I also like to give her the benefit of the doubt because not all traumas are easily erased especially if it scarred you deeply and for a very long time at that.
Taking it out to her students and the others is definitely invalid but we should give her character the grace to explain herself. I mean the fact that she's meeting with Tsukada-sensei was probably a big leap for her. Even Subaru still cannot find forgiveness towards her fear and hatred I think it's the same for Toki-sensei, it's all why she got affected by the words of her students. The fact that she's being given the limelight, the author probably wants to introduce her more profoundly.

I totally agree with your point and I wanted to add that: before becoming a teacher, she should have worked on her trauma.
Becoming a teacher with the mindset of not letting the trauma repeat is awesome, but making your trauma affect how you deal with people who has nothing to do with it it’s a big no.
I don't hate Toki like it's clear she's traumatized from the innocent I get it. What I can't get is why did you decide to bring students who have nothing to do with this into your personal issues...it's also just being given the opportunity to at least fixed what you did wrong for these students and not taking the opportunity for that, to at least do better for your current students is just crazy to me. You wouldn't want to at least right the wrongs for how your mentality affected this school these students and the school of students who have no part in what happened in the past? Homeroom Teach please at least call her out for that, cause there's no excuses.