Not sure if they still do the "slime" tour at the studio but they did when my now 24 year old was 10.
He stood in front with the tour guide as they showed how they make the slime. He asked a question, I think it was something like what food coloring or how did they come up with green as the color. But he got the guides attention.
Then when the guide asked who would like to be slimed he jumped up and down with the rest of the kids. My other 2 boys one older, one younger, were there also but they picked my son who had asked the question.
Definately have her move to the front with the kids, and try to ask a question. Then make a fuss when they ask, don't stand there with just her hand raised.
And don't forget to bring your camera. This was our last attraction of the day and I had run out of film. I never thought one of my boys would be picked. So I don't have a photo of him in the little pool being slimed. Peggie