I had the exact same problem!! What you need to do is just say to her this is MY wedding this is how I want MY bridesmaids to be if YOU do not like that there is the door make sure it doesn't hit you on the way out lol!!! This is supposed to be fun if you are already having the stress's tell her to walk I would!! Don't let anyone tell you what to do with your wedding you will find that you will have wished that you did it your way and regret it