I was asked to be a bridesmaid for a family member's wedding. I am a college student with a pretty tight budget, but I agreed and saved up for the dress and alterations. However, after I bought the dress, the bride decided she needs alterations to change the design of the dress. I did not budget for changing one dress into another dress. I want to make the bride happy, but I feel like she is asking a lot. What should I do? Does this fall under my duty as a bridesmaid or hers as the bride?