I made the mistake of choosing my older sister to be my MOH. She isn't married and lives on the other side of the state. Instead of helping me with my wedding planning, she calls me to help HER with the bachelorette party/shower planning and tells me that she thinks it's ridiculous that I'm not paying for either of them. She had no idea what she was signing up for and I've tried to gently educate her, but she is wearing on my last nerve. She's convinced that the bridal shower should be the week before the wedding and gets mad when I say that it should be a month or two before. I want to ask her to step down, but she would not be gracious about it and it would cause a huge stink in my incredibly traditional Korean family. What should I do?