Fed up

My daughter is kicking guys in the groin and i cant stop her help she is 13 yrs old and today they called me from her school to talk to me again. the matter was the same. her teacher told me she'd kicked a boy's testicles today again she is doing the same thing all the time without any reason since she discovered how vulnerable and sensitive those eggs were on her brother accidentally. but my son never complained that she were kicking his balls also. i think she is doing this only outside I talked to her many times. i punished her, i tried every way. but when i get more agressive, im losing her and cant talk any more what can i do with this any ideas?