Or she might live a perfectly normal life. If people were taught to understand magic, and young mages allowed to practice freely then others would see it is not always bad.
A mage can go a lifetime without summoning a demon, and demons can come after non-mages as well if they dream, can't they? What about the Dalish? Or mages in other countries that are allowed to live free? Wouldn't you yearn for freedom if you were never allowed to have it?