"She forgot I took leave?"Woa, they still
"Oh ya, not enough people to work..."
It's not a bad idea to earn extra money when I'm still on leave. Haiz... but I have piano tonight. Why not other days? Tsk.
Erm... does she understand the reason of "I have piano tonight"? I forgot the word "lesson" after the piano...
"Will you ask me if I can work when there are not enough people again?" is what I felt like replying. But I reckon this kind of action is a bit 不要脸. So, I'd just put this intended reply here.