Really upset (What should I do)

Iesha
So my baby shower is Sunday and a really good friend that I call my sister is doing it for me. So for the last week and some change I've been saying I'm going to get the rest of the things for it on Friday Aug 5th. My mother was suppose to go with me. She comes in at 615 and says let's go we have to hurry I have a date(Basically some random guy) so I automatically got mad and didn't want to because I did t want to rush. On top of that we were suppose to do laundry together and this date was more important. I have been worked up crying off and on for hours. Am I selfish or what? I feel like it's fine your back out and daring but your only daughter is also 8 months pregnant and wants your attention and to do small things that matter to me in a dig way. Idk what to do or how to feel. I really want to pack my things as well as my sons and go somewhere else. Which I don't have many options currently. What should I do?