She would rather take an extended break, implying that something health related out of her control is going on, than to swallow her pride and just admit she irresponsibly overslept.

I don't hate this quirk of hers where she refuses to take fault for anything, it's cute.

I'm also pleasantly surprised all off the Myth girls still seem to like her and that her personality doesn't bother them too much. Maybe because she goes out of her way to be so genuinely sweet to everyone.