Turns out she’s not underage (most likely)
Her birth date was confirmed four years ago,
imgflip.com/i/4ylzti
Who would lie about being underage? That’d mean she would’ve been like, 7 when she joined, which is very unlikely.
She said she was 12 three years ago, and now she’s fifteen (and one month) old
imgflip.com/i/5re970
You have little to no ways of backing up your “she’s underage” argument. And even if she was, did suggest not fighting her. Just report her to a sitemod (who isn’t super biased)