Also, I don't know if this is the translator's word choice, or just the author disregarding real life logic. What kind of treatment could possibly change someone's gender...? Even if her gender somehow switched from boy to girl, she'd still have to go through HRT process, which wasn't mentioned. Did the doctors pump her body with estrogen juice? XD Your body doesn't magically go from one thing to another. Or maybe she just made up an excuse.
Or maybe this is just a manga's logic and I'm reading too much into it.