She was this close to joining the Wards no matter what trouble they were going to throw her into, to have a tinker friend. And now that can't happen.
She goes home and has another argument with her parents. The ultimatum is - either join the Wards, or permanently grounded, absolutely no tinkering, too dangerous. Even if she was a big hero and tried to save the day - far too dangerous, she almost died. They find her basement stash, what's left of it, and hide it all away from her. They spend all day with her, no chance to run off.
She tries to stick out the grounding - one day, two days, then she finds herself starting to take apart her school locker's lock to make - something for stabbing, her power told her - and that evening she tells her parents that, fine, she'll join the Wards.
Her father calls the Protectorate office's public line.