Should I get involved?

[Kirtis]

Hey I'm 23 and have been a personal trainer for 2 years. My client is 14 (15 in two days). About an hour ago I was checking my Facebook and her profile picture came up on my newsfeed... I saw it had a lot of comments and I've been training her for a year so she's like a little sister and I know she gets really badly bullied at school so I checked through the comments on her picture and most of them were horrible and saying stuff like "Go die you slut" or "You're not wanted" or "Fat" and also they wrote "Ugly" on it. I'm so angry... No one is sticking up for her and I know her mum doesn't really care about the bullying. So should I step in and stick up for her? If so what should I put? Any suggestions??