She may be encountered during A Healing Hand quest which is requested by the Corporal Vale. He mentions to the The Herald that the refugees at The Crossroads could use a healer, and suggests looking for one in Redcliffe Village. She's reluctant to go at first because she believes that the people at the Crossroads wouldn't welcome an elf as their healer. After you convince her she can be found in one of the houses in the The Crossroads.
During her quests she asks Inquisitor to bring her certain herbs in order to treat injured patients.