Thanks for writing your query.
It will be helpful if you give more information on :-
1. Does she sleep normally at night?
2. Any history of stress
or mental tension?
3. Whether she is taking any medicine?
After reading your post, I would like to suggest that she should get following investigations done :-
2. Serum Calcium.
3. Serum Uric Acid.
5. Blood sugar levels.
She also needs a clinical examination. I would suggest that you should get her examined by your physician. Anxiolytics may be helpful, but they may be taken under medical supervision only.
I hope this is helpful to you.