My take on the whole thing – it depends why you’re dancing. If you’re jealous of the men, go get a life and realize that there are just some things in life that you won’t get because you are a female. If it’s because you’re filled with an overwhelming love for Hashem and the Torah, then go ahead, dance away, as long as the mechitza really is a proper mechitza and the men can’t see you.
But I think the whole thing is pathetic anyway. In my aunt and uncle’s shul (EDITED), they put up a mechitza so the women can dance, but the mechitza is iffy (latice-work on the top) and it doesn’t go from wall to wall, so any man can come watch if they want.
I say just be satisfied with watching the men. It’s worked for many, many years, and there’s no reason why it shouldn’t anymore.