Herbs are medications. Like any "drug" I don't advise anyone to take them without clearing it with their doctor.
She has and the doctor and her discussed the dosage and possible side effects.

I would strongly urge anyone not to self medicate and talk to their doctor. You can find reams of info on-line and since Dr's are not trained in Herbs/Healing foods, I'd download and print out some info to share/educate your physician so your both on the same page.