My fiance has a groomsmaid standing on his side. We decided to put her in the same dress as the bridesmaids but in black so that everything will look cohesive. We picked the dresses and she agreed to it 3 months ago. Now she says that she can't afford it, even though it is only a $100 dress. Should I fight it? I understand that doesn't have much money, but she knew the price of the dress months ago. Do my fiance and I need to pay for it? Should I let her wear a black dress that doesn't match the bridesmaids? I don't know anyone who has had this situation, so I need some opinions! Thanks!