Hello strive356: I'm sorry I don't really have much of anything to offer with regard to this. But I saw no one had replied to your post. So I thought I would. I don't know where your niece lives, of course. One excellent resource for children with disabilities is the PACER Center in Minneapolis, Minnesota. Here is a link to their website:

PACER Center - Assistance for Children with Disabilities, Bullying Prevention, Parent Workshops

May it be of benefit.