HELLLPPP!!! BOSSY DANCE TEAM MEMBER!?

okay so i am on my school's dance team. there is me (junior) , 4 sopres, and 10 freshman. for some reason my coach didn't choose a captain this year. so the returning members (me plus the sophs) are all working together to help the team. the only thing is, this girl named dana is a sopre and is trying to overrule all of us. dana is the most bossy person i have ever met and would make a horrible captain because of it. she has only been dancing for 4 years, and i have been since i was 4 years old. she has been on the team 1 year, and i have been on it for 2. she thinks she has more power than me and point blank said she does not believe in seniority. EVERYONE on the team hates her, including the coach, but she will just not step down. what should i do??!?