No, your child will not be a better musician after attending one of the many summer music camps. However, your student would also not be a better basketball player the week after attending basketball camp. Yes they will spend the week involved in an environment customized to help their musical growth. Music is a lifelong journey and marked improvement takes time.
Students often experience personal revival at summer camp. It can be a great time of spiritual awakening and faith building. Sadly, once they're back at home, there is often a falling away, and the closeness you discovered can diminish.