What is the purpose of cancelling last minute? That seems incredibly immature from my perspective - not trying to attack the idea, just wanting to understand the logic.
Additionally, it seems like a couple of you would not entertain listening to her at all - what is the reasoning behind that?
I was just joking about not going, what I said before was to go but don't do anything other than listen and validate. I do agree with the others that it's a waste of time because it is only a reflection of her feelings and thoughts at that one particular moment in time and her feelings are subject to change without warning. But it is good practice for listening and validating. You can show her you CARE about her feelings even if you don't AGREE with them.