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To meet with her was my orignal plans. I asked to change them now she is pissed off about me because of it and doesn't want to meet now.
I'm guessing this is one of the reasons she is an ex? If not, just think of all the other reasons. Stop worrying so much about what she thinks. It's sounds like you two are back into the same old shit.
Tell her you can see her on monday or another day, and if she can't she can't. DO NOT show your desire to see her. Let her believe it doesn't matter either way. She will most likely comply for the next meeting.
Don't fall back into old habits with her.