Hi, Welcome to Health care magic forum.
Your friend is 13 years of age, and complaining of weak stomach, numb
limbs, can barely walk, migraines and
sore throat.
It could be due to the sore throat and infection,
anemia,or the problems of the hormones, due to the changes in the
puberty, may also lead to the spastic dysmenorrhea.
I advise her to consult a physician for diagnosis and treatment .
She may have to get the culture and sensitivity of the throat swab,and other tests for confirmation.
Wishing for a quick and complete recovery. Thank you.