I'll try and make this as short as I can. MOH/Sister was in charge of my girls' night out. It's all she's talked about since I got engaged.Fast forward to 2 months before the wedding: 2 co-workers and good friends want to throw me a lingerie shower (which they knew I wanted) so I said, let's make it part of my GNO. Talk to my sister, here is her info. Don't do anything without talking to her.Next thing you know, MOH/sister gets the invitation in the mail on Saturday and my co-workers' names are on there as hosts. She is heartbroken as am I. I don't know why they would purposely do this. One of them has said, she told the other one, hey take my name off, talk to her sister first, etc. And I believe her, I've known her for 10 years.The other co-worker is very passive/aggressive and can make my life miserable here if I cross her. I don't know what to do. I need help.