I am feeling upset & mad. My SO sister was supposed to be doing most of the baby shower which is 3…

I am feeling upset & mad. My SO sister was supposed to be doing most of the baby shower which is 3 weeks away and she hasn't done anything even when I bring up things she avoids it. So now I'm doing it myself and it's not even enjoyable. I wish she would have just said she couldn't do it so I could have gotten everything done