Bridesmaid dress for friend’s wedding

One of my best friends is getting married this fall. She has been super open with me about plans throughout her process. She wants all of us bridesmaids to pick our own dresses. The only requirements are that they are floor length and one of her colors. She doesn’t want any of us having the same color, though. I have tried showing her dresses that I am considering more than once. I’ve asked her what she thinks and what color may work since her MOH and sister get first pick. When I do, she stops responding to me. She just doesn’t answer. She could tell me that she doesn’t like them or that she doesn’t know about the color, but she just ignores me instead. At this point, I know which dress I really want but I can’t buy it without her approval because I don’t want to be out that money if she ends up hating it or the color. It’s all driving me nuts.