How can I convince my coach to do this my way?

I'm cheer captain and I really want my squad to win at camp. My coach is used to controlling everything because we didn't have a very good captain last year. I have a lot of experience(more than my coach, in fact) and I would say that I know what I am talking about. I have been a cheerleader for seven years, and I'm only a freshman. We learn a routine at camp that we compete with, and we get an allotted time to add our own thing in(i.e. stunts, tumbling, etc.). Our coach doesn't believe that we can hit the stunt that we are trying to do. I'm not quite sure that she completely understands the stunt, so she just says no. She just wants us to dance. We will have been dancing for the entire routine, so I think the judges will understand that we can dance, and the co-captain and I want to show off the squad's other skills. We didn't win last year because we did a simple stunt. How can I convince my coach to let us do this?