This is why I had no bridesmaids...just two flowergirls (my nieces) who were perfect...I figured that as I was in my 30's that my friends deserved to enjoy the day, not have responsibilites and NOT have to wear matching dresses! Turned out it was the best decision I ever made. I was a adult when I got married and I could handle the day on my own.......don't worry....it still had some hiccups like my father and I argueing about whether or not I should take my mobile.....I took it....funny to look back now and laugh but at the time I did bite my tounge quite a bit.

Sorry to seem like I'm hijacking ......I'm not.....I think your approach has been fine so far. But if you do want the friendship to continue then be honest with her. You will not forgive yourself later on.....far easier to forgive your friend that forgive yourself!