Once her classmates are allowed to have a turn on it, I predict a 17 minute use life before something breaks... which may be industry average for all I know.
My daughter and I did something very similar but on a tabletop scale when she was in 7th grade. She had to make something from recycled materials. I made a little lever system and then used rubber bands and pencils for the flippers.
She did the rest with my input. It was the hit of the class, much as I expect yours to be.
Nicely done!