Am I a horrible friend?

My friend's baby shower is tonight and I've known about this for a couple of days. Mind you there were no invites send out or anything of that kind so I didn't know the address to begin with. But I told my friend when she toldme that I was going to come which I was; I was suppose to buy a gift and everything. Now it's saturday night and I completely forgot about the baby shower. I didn't buy a gift, I don't know the address and I didn't have any clean clothes.

So my friend calls me and say "Where are you?!" and I'm clueless then she starts yelling at me about not being at the baby shower. I told her I completely forgot about it and didn't get a gift or anything. She said to come anyway but I do not feel comfortable showing up there without a gift so then she yells at me again because most of our old gang is going to be there so I tell her I MIGHT come. Might being the keyword. I look in my closet and I realize that I do not have any clean clothes and when I mean no clean clothes, I mean none once so ever, I tried to call her back but I didn't get an answer and I dont want to call back to have her yelling at me like I am 3 years old. Now my sister is upset because I am being a "horrible friend" Yeah I feel bad. But horrible, I think I'm far from it.