Sister bent over in front of my husband!! 😒

I need some advice. So.. over the weekend my family went to the mountains. The family is in the kitchen and my husband is in the living room with my 2 year old nephew and my sister walks out in her thong bathing suit bottoms and a shirt and bends over in front of my husband. Let me remind you that it's snowing outside and there's no hot tub/pool or anything to need a bathing suit for. She only had the bottoms, not even a top. She realized he wasn't paying any attention so she lays over the couch and stayed there for 5 minutes. My sister and I have NEVER gotten along. She ruined my wedding on purpose and has always treated me terribly. The entire trip, she would walk by me and say rude comments. I'm pregnant and so exhausted all the time that I frankly just don't give a shit and don't have time for her to act like a child. I also didn't want to ruin the family trip so I kept my mouth shut and ignored her. Then she's going to do this to try to piss me off? I just sat there watching and laughing. First off, my husband does not want to see your cottage cheese covered ass and your crotch hair hanging out of your underwear. Y'all, she did this in front of my 2 year old nephew!! (Not her son either!) I pulled my husband to the side later on and told him how disgusted I was and he had no clue what I was talking about. He pays zero attention to her and can't stand her either because he knows how she is. Y'all don't want to even get me started on the way she has treated us. How would y'all handle this? We have another family trip coming up in February and I honestly don't even want to go because it's going to be the exact same thing. What do y'all think I should do?