Ok so the date I picked for our wedding is Sept 12th 2012! (one year away!! YIKES!! lots to do

) A friend of mine whom i have known for a few months is getting married shortly before that in our home town. I'm doing an OBX wedding

She had asked me months ago to be in her wedding, now its becoming a bit of a pain she is telling us what our "schedules are for about 2 months before the wedding, and other things she needs help with but I am also trying to plan my own and I am also in my twin sisters wedding and my brothers wedding which are all before coming up in the next six months. I am stuck as to how to handle this because I have spoken to her so little she does not even know that I have set a date shortly after hers. She is a great friend who ive know for about a year and a half but I barely see or even talk to much for that matter. to be honest im not sure why I was asked to be a BM but was honered she thought of me as such a close friend. But now its becoming quite a bit to deal with between a $200 dress (not yet purchased) and all the weekends we are supposed to dedicate to wedding stuff. Most of my time will go to my sister and brother and my fiance. Not sure how to handle someone who is already so demanding a year before her wedding?? do i cange my date or hope she will understand??