Bridesmaid's Wedding is too close in time and too far away

Hello Weddit!

So my amazing FH and I got engaged in February. We knew we would need some time to get our finances ready for the wedding, so we decided to set the date for March of 2015.

My friend that I was living with at the time moved a good ten hours away in May and announced she was engaged in June and getting married early November '14. I am so excited for her, that I quickly agreed to be a bridesmaid without any though for the expenses.

Travelling and lodging expenses alone will be well over $1500 if I'm there for the week. I love this girl like crazy, but the idea of taking money from my wedding to go to hers breaks my heart. Her parents are paying for her reception, and I don't think she understands how hard we are working to make ours happen.

I'm trying not to be defensive or unfair, and put all of my feelings about her "stealing my thunder" aside. She is moving across the country after the wedding and if I spend $1500++ to go to her wedding and then she suddenly is unable to be in mine, I will be beyond crushed.

Anyone have similar experiences? Im worried this could a friendship breaker.