My 11 yr old niece will be riding the bus for the first time ever. She will be in 6th grade. She is very shy and just painfully easily intimidated, etc. but very very sweet. Her parents (and me!) are nervous that since her bus will have high-schoolers on it, what if some of the guys or girls mess with her, or try to intimidate her, or just pick on her. She's pretty good about standing up for herself with her own age, but this idiot school system has middle schoolers and high schoolers on the same bus - so a little 6th grader rides with all the way up to 12th graders. Any advice???