Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I cannot tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information.
I am sorry you have not provided much details of the pain and the cramp so I will be unable to answer your question in details.
Occasional cramps can happen because of electrolyte abnormalities in sodium, potassium, calcium and magnesium since these are important for proper muscle function.
I am not sure whether this leg pain is a neurological issue. It may be musculoskeletal in nature
I would advise you to take her to her PCP to get her evaluated for this leg pain. He can examine her do a some routine tests and then make a referral to the appropriate subspecialty if needed
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.