I have this happen. I forgot about it. It has become just a regular occurrence. It comes and goes. Sometimes I get out of the car our up from sitting and one of my legs will do like a karate kick move. I have no control of it.
I have had this Long Haul Covid since 01/2021.
Good luck to your Daughter. I hope she is able to find some sort of relief with a diet change, vitamins, IV treatments, or some sort of medication that works for here situation.
Good Luck