This thread is exactly why I'm so torn about my DD who loves dancing around. I didn't do dance, I did drama as a kid, so I know nothing. The local classes seem to have waiting lists that run from pre conception and I don't have the confidence or the knowledge to know where to start!
Honestly, if she loves dancing, find somewhere for her to dance. I too was an absolute non-dance mum when DD started skipping round the village hall at 3, and she went to her current dance school when she started reception simply because someone we met in the park mentioned it as being close to where we were living.
That will be 10 years ago come September. DD will never be a ballerina - too big - and, while she enjoys competing in a group, has never got anywhere very much as a soloist. She's progressed steadily through grades, and has a lovely set of friends. Along the way she has acquired a phenomenal work ethic, a belief in the role of practice in success, a certain poise in presenting herself, and the ability to both win and lose with a smile on her face.
If you find yourself in a dance school with a dance moms approach, move - ones totally without that ethic exist as well, and there seems no point in avoiding a whole activity 'just in case' Football dads can be just the same, in some clubs. School gate parents, equally. Just choose your company and club.