baby shower rant

So if your family have started organising your baby shower and gave your close friends a month and a half notice to the date... then said friend messages you and requests quite rudely for you to change it from an afternoon thing to a before lunch thing because she can't get the afternoon off work.... you tell her no as it's all ready set with everyone else and then the friend reads your message and ignores you?
Am I being crazy or is this slack of a friend? 
They knew the dates before I even did. 
By they I mean her and her sister are both being rude and expect me to change things to suit them and then ignore me. 
Why do people mess with crazy fat ladies