Here are my thoughts:
1. Refer to a CHEK 3 or 4 and NLC 3. They can do a full assessment on why.
2. Julia Ross states that grinding of the teeth is a serotonin deficiency.
3. There are many beliefs that if she is grinding at night, which I see to be true as well, that this is a sign of a parasite.
4. Grinding of the teeth in TCM is a sign of wind in one of many channels. This can be from sleeping with a window open, a fan on the face, driving with the window open, etc. Addition of weekly acupuncture treatments along with nutrition, amino acids and soft tissue work on the TMJ usually does the trick.