I was asked to be in a friend/acquaintance's bridal party about a year ago (she and I were VERY close growing up but minus the day she asked me to be her bridesmaid I hadn't seen her or talked to her for a year). I said yes because I felt bad saying no, and then I didn't hear from her until now. She made a group chat for bridesmaids back in the summer of 2018 when she got engaged but then it went silent, no mention of her wedding date or updates or anything.
I set my date, and she is now getting married the week before I am (and she is getting married on a Friday and I will be out of PTO due to my own wedding and other weddings I have committed to that had set dates and whatnot). Since I do not feel close to her, can I politely back out?