So, we're not having bridesmaids or groomsmen at our wedding because we are keeping the ceremony part to a bare minimum. But, I still would like one of my best friends to help me out with a few things, and I've told her that if I were actually having a bridal party, she would definitely be a bridesmaid in it. So, I ask her (this is 3 months before the wedding and 2 weeks after she RSVP'd as a Yes on my website) to help me and she says she might not be able to go to the wedding afterall, because she wants to travel to Peru at that time and she just found out she can get a great deal on a trip! We have been great friends for almost 10 years now, and she's telling me she would rather go on this trip to a country that isn't going anywhere for a long while, than attend my one-time wedding! Should I be pissed or am I overreacting?