I'm so,so sorry this is happening. As our DD got older/into the mid teens, we had some VERY moody moments with her on our trips (to the point that I almost didn't take her on her graduation trip) , but the worst was our spring break 2022 trip to Universal. She and DH got into a HUGE argument in the room the second night, and it was awful for the next few days. she refused to be anywhere near him, they both sulked, gave up valuable park time, etc, and we were all ready to just go home. It really changed the rest of the trip. We all finally decided we wanted different experiences out of theme park visits, and that we'd all do our own things sometimes. I think it's a great idea to either have them go off just a bit on their own, or just stay the room, watch TV,relax away from everyone, or choose what the group will do, what rides to ride, etc. Our DS is much more amenable with traveling, a go with the flow kind of person, but lately he REALLY appreciated going back the room for hours in the afternoons, and just playing his video games, or watching TV, some of his usual home routines. He's pretty reclusive at home, and while he enjoys all the rides and stuff at the parks, he definitely needs a break from all of the activity. He's 16 now, and DD is 19, so we dont' mind letting them go off on their own, or just hang out at the room for just a bit now.
I really hope it got better for everyone, and y'all were able to enjoy the trip. I can totally empathize with all of it.