I would really like if at some point later on, one of the bullies she's chasing after asks her something along the lines of "What are you going to do once we're all dead?". It would really be a hard hitting question because it's a good one; Maria basically changed the course of her entire life for the sole purpose of getting revenge on these bullies, going so far as subjecting herself to some pretty horrible stuff (see: the principal). It really makes you wonder what the hell she's gonna do once they're all dead, and I don't think it's something even she has considered. Will she continue to be the school's nurse and help other kids against bullies, or or will she try to repair her old life with her ex husband?
I can only imagine the shock she'd receive after getting asked that question, would really force her to seriously think about what she's doing.