Yeah I'm going to retract my statement and say that while it may not be an absolute RULE that young people shouldn't do children's shows, it is a good guideline. There are only a few (from the sounds of it, like kristenl's daughter) kids who have the maturity and poise to perform in front of people.
So, my suggestion is to wait and perfect your magic, then when you do put yourself on the performing scene you'll have a large and polished repertoire.
Here is a strong suggestion -- and I can already hear the groans before I even say it
-- BUT, I'm gonna say it anyways!
My suggestion to the young performers is to take a speech class or enter a speech competition. Something that is going to force you to stand in front of a crowd and express yourself verbally. Back when my daughter was in 7th grade she entered a speech contest. 16 schools participated and the contest was comprised of 7th and 8th grade students. My daughter took home 1st place --- and unknown to us at the time -- is that the winner of the competition went on "tour" giving their speech at different events. I cannot begin to tell you how much that has influenced our daughter and has benefited her magic. She is not afraid to get up on stage or take the podium in front of hundreds of people. She is comfortable and at ease. She has applied that same knowledge and experience to her magic.
If anything, she gets more shy on the one-to-one walkaround -- crowds, she is in her element.
Just waiting for the groaning to begin --- but it is a serious suggestion that I think would really benefit everyone as a performer, and perfecting the art is what we are all after.