spoilers:end of spoilers
They didn't find her parents in the Winterworld HC but they did find her grandfather.
The Winterworld HC with Wintersea is in black & white and has this cover:
Collects Winterworld (1984 Eclipse) #1-3 plus previously unpublished material. Written by Chuck Dixon. Art and cover by Jorge Zaffino. Dixon & Zaffino's long out-of-print classic is finally collected! In a bleak and desolate future, when our world has been encased in ice from pole to pole, an amoral adventurer and an orphaned girl form an unlikely alliance-and together fight tooth and nail to stay alive. This features the stunning, groundbreaking artwork of Jorge Zaffino. As a special bonus, this hardcover also collects the never-before-published sequel, Wintersea! Hardcover, 150 pages, B&W. Cover price $19.99.