Sounds like you guys just aren't a good match. You're one for punctuality, she's clearly not (and it annoys you, and will continue to annoy you for as long as it happens), you're one for sticking to whatever word you've given, she seems to be flexible to changing plans without letting you know, you're one that returns calls and can be gotten a hold of, she's not, etc. etc.

Just seems to me like you guys aren't compatible and probably won't be.

Alexi