Agree. There's nothing here to suggest that a simple change in geography by changing school promises to fix or change anything. If a large part of your daughter's problem is her OWN attitude towards rules and behaviors, new walls and different classmates or teachers isn't going to change that. It could actually have an adverse effect, if the child perceives the change to be punishment for her behavior (even negative attention is attention), or, if she's already having trouble with coping skills and then you throw her into a totally new environment, compounding the number and extent of things for her to cope with. Carl's suggestion regarding counseling is right on track - children of divorce are many times more likely to have these types of issues, no matter how sheltered from parental conflict the parents think the children might be. Some time talking to an experienced counselor can often help children to find their voice and express their angers, fears, self-blame, and other issues in a much more beneficial manner and can help them learn healthy coping mechanisms and how to "act in" with self evaluation rather than acting OUT against others.
It also couldn't hurt to have a discussion with the child's physician just to rule out any complicating issues such as hormone levels, dietary contributions, etc. Make sure you cover all the bases - at 9 she's got puberty just around the corner and if she's "strong willed" enough at 9 to be getting suspended from school, you and mom need to work together to get a handle on her behavior BEFORE you start getting calls to pick her up at juvy or are meeting your first grandchild a decade before you're ready. But a change in schools alone won't do it. If you and mom don't have a handle on the underlying issues BEHIND her behavior, then it's time for one or both of you to seek the assistance from a professional to identify the issues from the child's point of view and develop strategies to get a handle on things while you still can.

