Propranolol is in a group of drugs called beta-blockers. Beta-blockers affect the heart and circulation.
Propranolol is used to treat tremors, angina (chest pain), hypertension (high blood pressure), heart rhythm disorders, and other heart or circulatory conditions. It is also used to treat or prevent heart attack, and to reduce the severity and frequency of migraine headaches.
Poor child, sounds like she was really suffering from the list of symptoms those drugs treat.