Here's my BM dresses.. a problem though!!!!

Okay so of my 2 future fsil's one totally HATES the dress and thought nothing to go home and tell FMIL this,, she is the only one with a problem.. what do I do? Everyone else LOVES it and so do I! She is starting to really **** me off and I dont want this to start a HUGE thing, although I feel that her telling her mother, when we got back after we were already at the place and she tried it on, where there was another BM with us, she waited until noone else was there, and it was cowardly. What do I do? Is It ME?????????