I had a similar idea, here is as far as I got with the character.
This is my current idea. A full blooded Fey who tricked free will off a human.
(http://img.photobucket.com/albums/v15/Ramaloke/The_Seeress_by_Shikijiyu.jpg)
Frieja Winters
High Concept: Free-Willed Winter Fey
Trouble: "Hounds of Winter, At My Heels"
Other Aspects: "Beautiful… Like an Ice Sculpture"; "Words Are Binding"; "I Stole Winter's Breath"
Stress: P OOO(OO) S OOOO M OOOO
Skills
5 Discipline
4 Conviction, Lore, Athletics
3 Presence, Rapport, Alertness
2 Endurance, Deceit, Contacts
1 Resources, Empathy, Intimidation
Powers and Stunts
-4 Greater Glamours
+1 Item of Power (Breath of Winter)
-4 -Unseelie Magic
+3 The Catch (Cold Iron and Summer Trappings)
-2 -Inhuman Toughness
-2 -Inhuman Recovery
-1 Fey Bargaining Tactics
Breath of Winter (Item of Power) [-3]
Description: A silver necklaces with a small glass bottle held in place with a delicate latticework of silvery snowflakes. Inside are glowing snowflakes, which swirl around endlessly. It is always cold to the touch.
Musts: An aspect directly referencing this Item of Power.
Skills Affected: None.
Effects:
It Is What It Is. It's a Necklace.
Unbreakable. As an Item of Power, it cannot be broken, save through dedicated magical ritual predicated upon perverting its purpose.
Unseelie Magic. This necklace gives you the ability to use Unseelie Magic. See YS 161 for details.
Fey Bargaining Tactics [-1] You, like all other fey, have a natural flair and skill at making deals. You make all social rolls at a +1 bonus when making any type of binding agreement.
When she is Glamoured she looks like this:
(http://img.photobucket.com/albums/v15/Ramaloke/Gia_by_WarrenLouw.jpg)