Dreenan arrived on the island by boat, along with her two sisters and brother. After they arrived, they were helped by a Toa of Fire, who offered to teach them the ways of medicine, and let them stay at his home. Her oldest sister and brother were the first to leave and head out on their own. The separation of those two was not a friendly one.
Later, Dreenan herself decided to go out on her own. She was different than how she was when she was first taken in by the Toa of Fire. She was still prone to anger and hatred, but she had been taught to better resist them, and despite her attempts, was unable to learn medicine from the Toa.