Why is my friend mad at me?

I been friends with this girl for 3 years we always had a problem with eachothers attitude mine is a bit dramatic she takes it to emotionally but now it’s worst her boyfriend is going out with his family tomorrow and she asked if she can hang out with me and my boyfriend and friend but she didn’t want to do the first part of the day I said ok we go bowling at six than she got a attitude with me saying I can’t it’s to late I’m going out to dinner with my mom and she blames me because she didn’t want to do what me and my friends have had plan for months why is she mad this was all on her right?

Why is my friend mad at me?
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