We already know this Maria can shrug off anything for the sake of her revenge, well it's questionable whether this child's punishment will even succeed to land in the first place
like someone already said, she's being groomed :( no that doesn't excuse her actions but if the author gives us some backstory rather than making her a plain cardboard villain I think this would be a pretty good framework to build on. Considering how this series is going I don't think the author would half ass it.
since I've already ranted I'd like to see the girl with specs and shoplifting charge on her again :) I feel like that'd tie up the story nicely. maybe somewhere like she acts as Mother's alibi