Keep excellent documentation, and note anything that seems even the least bit off. Keep every e-mail, the ones she sends and your replies.
Also talk to other teachers who either have had or currently do have this student. It sounds like you've got a great administration, go to them with concerns and issues.
I didn't have a good administration so I left teaching. (I'm actually one of the few teachers who made it a whole year there!
)
Just document everything, and remember while your focus is on the academics, you have to look out for that kid, too. He or she may be dealing with a lot more than just what you see on the surface. I had a student like that, and it broke my heart. My administration wouldn't do ANYTHING because he was a paying student at a private school. My heart still breaks for him though.
__________________
“All his life he tried to be a good person. Many times, however, he failed.
For after all, he was only human. He wasn't a dog.”
― Charles M. Schultz
Warning: The above post may be dripping in sarcasm and full of smartassedness.