Why does my friend get made at one mistake I made and not the other?

She got mad that I didn't follow up after a car accident and went off on me that she does so much even though I do too. I called her when it happened but because I didn't do it twice but her friend who she helped made a baby shower for, said her friend never did anything for her and is selfish but she never complained even though her friend used up her time and money for the shower. How is that fair? She said I'm her closest friend but still that makes no sense

Why does my friend get made at one mistake I made and not the other?
Post Opinion