Gosh, that is frustrating. And I guess a 7yr old isn't going to be running with a bunch of homies at school, huh??? ;)
There is a car alarm system that detects the pressure change in car tires and if the car moves down in elevation or whatever when it happens. I was looking into it when my car was vandalized so much last year. It's a VIPER product, and it isn't cheap. But with me living in the city, I didn't know if that would make mine MORE of a target with living only 4 blocks from the high school and 3 blocks from the one middle school. I'm positive it was kids... plus with the music they downloaded onto my cell they stole from the car, and charged a couple hundred dollars worth of downloads, they had to be teens.