my DD has, for the second time, been caught taking part in a whatsapp group sending nasty texts. Both times the texts were in response to one of her friends being called something by another girl. we haven't seen the transcript yet and don't know how sustained it was, but she admits there was real nastiness and swearing involved. we've come up with a punishment, but really the point is that she needs not to do it again. she's a good kid overall, she knows it's wrong, she's been taught it's wrong at school and home, so i don't think having a "serious chat" is the answer. what can we do to prevent this happening again? I've suggested putting an app on her phone that sends us copies of every text she sends but DH thinks this is too heavy handed.