Cheerleader interference

[MOFFICIAL]

A freshman boys game I saw today had a strange situation. Team A makes a layup. Team B secures ball and wants to throw long. He winds up to throw long and a cheerleader on the baseline during her cheer activity accidentally hits ball causing ball to go onto court. Official whistle play dead and give B endline throw in with moving privledge.
My questions:
1. Is there any type of penalty provision by rule?
2. How do you keep those pesky cheerleaders from working your endline?
Serious replies only- I been around this forum long enough to know we have some real comediens.