Because he's the type to come in to help at the very last fucking moment and then he fucks off again to do whatever business and shoos everyone away instead of helping the entire time.

[ That's the vibe she got anyway.

But also she's just ANGRY because she came into this game with her memory fucked up because NIER is STUPID and then a Kingdom Hearts CYOA all about MEMORIES came along and fucked up her memories EVEN MORE and she wants to take it out on Mickey Mouse. ]