Spoiler
She doesn't get the chance to use it, bc when he bracelet broke it sent the Prince (I'm blanking on his name rn, Aster I think?) to her through his powers, as he had put a charm/spell on it for whenever she was in danger.
He teleported in, saw everything that happened, and basically just yanked Aria and himself the heck out of there, leaving Mielle to face the music
Pretty much
Even if she does try saying something, how can she when Aria was technically with the prince the whole time (alibi) and/or he can always just say he saw the whole thing, who's really going to say anything against him when he's the prince after all?
On top of that, isn't the judge probably Aria's aunt/family member who has a soft spot for?
Mielle is just screwed from any direction and she doesn't even realize it
Also, here's the raws if you like them: https://newtoki95.com/webtoon/532874?stx=%EC%95%85%EB%85%80%EB%8A%94+%EB%AA%A8%EB%9E%98%EC%8B%9C%EA%B3%84%EB%A5%BC+%EB%90%98%EB%8F%8C%EB%A6%B0%EB%8B%A4&toon=%EC%9D%BC%EB%B0%98%EC%9B%B9%ED%88%B0
Hourglass time?