- Discuss with the classmate on learning disability, with the teacher
- get group of friends to convince to classmate into not teasing your friend
- spread awareness that each child is born a gem :P
- cheer your friend up saying many more challenges would come up later in life but they will not clear up if she keeps feeling sad bout her disability. :P 
anyways, here's my view get going chap!
and gimme points ^_^