Spellingbeefan,
It is 4 and under that can't get into the theatre. But, I don't think that they are strict about that.
I would suggest Grease but your right. It's awful. I have yet to see it. But, I have read all the reviews and heard word of mouth. It ain't good trust me.
But, If you want to take your child to see it and they aren't a fan of the cool sandy. Tell them this. That in the end Sandy didn't need to change because she got the guy by being herself in the end.
I would go for Hairspray. Saw it for the second time a couple of weeks ago. If she isn't so big on the story or show there are enough flashing colorful lights to get her to be entertained for the entier thing.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll