Most Helpful Guy
Her reason for canceling matters a lot, and I'd hope she was sincere in explaining why she was canceling the invite. Not sure if I buy the "after hearing my schedule" story, but if that was the case, she's hurting her chances of impressing me.
In the future, I'll think twice before opening up a time slot for her. There will absolutely be a back-up plan. Eventually, her word will be meaningless to me. That's a bad place to be.1