First Grade Girl....

Your little red-headed 1st grader is most definitely a victim of sexual abuse. Please report what you have observed and know to CPS (Child Protective Services). Her school can help with the paperwork. It is not complicated. And she does need your help. The obnoxious behaviors she demonstrates on your bus sound like "acting out" behaviors typical of abused kids. Be a hero and report her case ASAP. You will be glad you did. And good for you to worry enough about her and post her situation. The world needs more people like you who care for kids. They are the future.