I agree with the others that said that maybe something traumatic happened to her that you are unaware of. I would try talking to her first. I think it was a good idea to send a note to her teacher to make sure everything is going well in school.
How long has this behavior been going on at home? If it doesn't seem like anything out of the ordinary has happened to her, it could be, as Linda said, early signs of puberty...
If, after getting all the information from easy child and the teacher that you can, and you think that it isn't early signs of puberty, I wouldn't hesitate to have her evaluated. in my humble opinion, it is always better to be proactive. If she is evaluated and found to be a typical developing child, it will put your mind at ease. And, after evaluation, if there is a problem, it is better to find out asap so she can receive appropriate treatment.
I'm keeping you and easy child in my thoughts... WFEN
