It's easy to always think about the 'bad things' that might be the reason why she cancelled, isn't it?

Try thinking about the none bad things that could of happened, to make her cancel. Rather then the bad. You will find out tomorrow if she shows. If not, then perhaps it's something to do with her moving. Maybe she has a load of stuff to sort out. After all, moving is busy and hard work. So much stuff to do when you move.