Mysterious 14-Year-Old Book Character in Grey Robe

Book character. She's 14 years old, has sharp green eyes as intense as almost two emerald gems. She has very pale skin, almost ethereal. She's maybe 5 foot 2. She wears a dense grey robe that covers all her body, with the embroidered emblem of an asleep grey howl - eyes closed, wings closed - on the heart of her outfit. She's witted and very smart. She's more mature than her age would make it seem. She lives in the Basilum : a fortress built within a frozen and magical mountain surrounded by a dense supernatural mist.