Stepmother problems

Organising this whole wedding thing has been tough. There are so many decisions that we had to take (where, when, with whom, etc.) and still so many others that we will have to take (menu, flowers, cake, music, seating, etc.), I sometimes feel overwhelmed. Although today I am not overwhelmed, but rather upset and frustrated. My stepmother has apparently been verbally inviting her brothers and sisters to our wedding, obviously without consulting us. And without knowing that we have a maximum seating capacity of 80, who have all already been invited. As we had to set her straight in a very diplomatic and nice way, it was extremely upsetting to read her vexed emails today. It must not be easy being a stepmother. That must be why she feels so sidelined, as she says. She's bothered because she was not consulted about our guest list. Nobody was. And my own father and mother are not bothered by it. A clear sign of lack of confidence on my stepmother's part I would say.