She is one of two daughters from a good family with a splendid lineage. These two were elites who not only received training but also had crafting passed onto them by their lineage.
After being captured by Rou's group, she and her sister were the last of the elves to sucumb. Some time latter they where put to work with dwarfs, crafting mithril.
She and her sister are enthusiastic about crafting mithril alloys. Mithril crafting is something only the guard elves could do, so among those captured, these two were the only ones capable of it.