Oh boy!!! this is so bad that your niece has been threatened and harassed from that kid who has a violent behavior. This kid needs help! I can't imagine when this kid is growing up be an adult!!!!
What if you reporting this bullying incidents (all the facebook in massages) to the school, would it help?
Talking about online massage, I watch ABC news prime time not too long ago about cyber bullying and it said lots of kids have been threatened online and making kids feel embarrassed.
This is so aggressive of a kid in this age, I mean 13 yrs.old just a kid! why they are beginning this bad behavior by threatened people !!! do you think should we blame the parents for this kid that has bad behavior? I kind of afraid when Ty has to face with bullies in school in Middle school and I wish we will not have this kind of problems at all.
Perhaps your family much strong and always be there for each other and I'm sure you can find the way to solve the problem for your niece, hope she's okay and try to deal with this situation.
p.s. The Alphabet's Story, back then I used to teach the kids at pre-k and kids seemed to like it a lot.