S.L.
http://aacap.org/cs/root/facts_for_families/children_with...
http://www.mayoclinic.com/health/oppositional-defiant-dis...
Here are two links to this and I never heard of it although I have seen defiant, rebellious children. I would think she would be very rude, disrespectful, etc. to you at home if this is the case. Why should the school be the one to see it? I imagine the school does see it but you should be the one to see it and do whatever needs to be done as you are the parent. I hope you take care of this soon and before she's much older and much worse.