Im not fond of this kind of cliche. Standing for yourself is fine, but the fact that you are doing it only when you isekai feels cheap. In her past in ch 1, it seems the mc also experienced this situation before her isekai, and evidently did nothing herself.
It would be more plausible and rewarding to see character growth instead of some instaneous personality change.
Edit:
Okay, so she has always been this way and has stood up for herself in her past life. I take back the cliche development, but I’m still hoping for character development down the line. Most isekais don’t really develop their characters and end up bland.