Guys. My little sister (13) just messaged me her ex best friend bullies her at school and social media. She has asked me to message her and tell her off but would that get me in trouble? I'm 25 years old mum and I don't usually get involved in stuff like this but she is so upset I just don't know what to do. Before anybody asks yes my mother went to school principal but they don't seem to be too bothered about it. Thanks.