Thanks for writing to the forum!
Your daughter could be having sleep apnea and sleep tremors. You should consult a sleep specialist for this.
Having said this I would suggest you get the following tests done for your daughter if the sleep specialist does not find anything wrong with your daughter’s sleep pattern.
I would suggest you get the blood levels of the following checked if they have not already been checked: potassium, calcium, sodium, vitamin B complex, or vitamins B1, B3, or B6 and Vitamin D. Generally deficiencies of any of the above can cause muscle twitching and spasms in localized or generalized areas of the body. Get her kidney function, parathyroid gland function and adrenal function tests done because these affect the electrolyte balance in the body. Stress, alcohol, and fatigue all cause similar symptoms.
Hope these tips help. Please let me know if there is any thing else and do keep me posted. Take care!