I'm the worst friend....

I got over to my families house yesterday and completely forgot that today was my super good friends baby shower! I feel so freaking bad!! I'm so worried she is going to be really pissed at me. I told her I would bring her her gift and hang out for a bit if she wanted this coming week. I feel so bad! I am a little relieved too though, because I know she was going to have a ton of family and friends there and I have awful anxiety and panic in crowds. I usually suck it up and go though, but it's a little bit relieving. I still feel awful. Do you think she is going to be mad at me? Would you be?