I am sorry you are going through this at such a happy and special time of your life. I understand that you and your fiance would like his sister to be a bridesmaid, the sister herself would and so does your fiance's mum. The answer here would be let her do it now that you have asked her - it would upset more people now if you were to change your mind - and things could really get out of hand. The hairdressers appointment is to wind you all up, she is deliberately causing stress, anxiety and arguments - she is "attention seeking". She probably feels that her brother is being made a fuss of due to your wedding and she is being left out. This is her way of saying "I'm here" She is acting this way because " she can" and she is getting away with it. Play her at her own game, I will explain in a moment. The bad attitude and nasty treatment you have received in the past is stemming from a mixture of attention seeking and jealousy. Think about it each time she creates a fuss or argument, she becomes the centre of attention. I would guess that your fiance and his sister are either very close in age or very far apart in age difference. When you require her to go for her dress fitting, may I suggest you also invite her mum along this way she will be less disruptive and nasty, and if she does get out of line surely your future mother-in-law will step in and tell her to stop. Play her at her own game - do not rise to the bait, as tempting as this may be start ignoring her behaviour, shut off and don't let her get to you. When she sees that you are no longer stressed or upset by her, she will stop. Be strong with her and tell her when she needs to be in certain places and give her the time - do not fuss over her. When she starts to create - smile at her and let it go right over your head. You and your fiance concentrate on planning your beautiful wedding and looking forward to your new life together. Each time she starts smile and say into yourself " I am not going to allow you to stress me" I wish you good luck

What a horrible situation for you to be in so close to your wedding. I really feel for yourself and your fiance. I think that your fiances sister is unbelievably selfish, but I think that to cancel her as a bridesmaid would cause so much trouble and upset that it just isn't worth it. The whole family would be upset and the atmosphere on your wedding day would be tense at the very least. I would just ignore his sister as much as you possibly can. She sounds like she is an attention seeker, so to give her any of your time and attention will just make her worse. Avoid her as much as you possibly can, concentrate on your wedding plans and most importantly make sure that you forget about her and enjoy your wedding day. Just remember that it is your day and nothing she can say or do can change this. She is probably just jealous of all the attention you and your fiance are getting at the moment.