Snow-Woman was one of the protectors of “Earth Prime” before time was broken in the war between Tor and Rebborizan. As consequence of the conflict, Snow-Woman was zee-volved into a deformoid monster, under the control of Tor.
Snow-Woman is an analog of either Ice, Killer Frost and Marvel’s Iceman, kind of character. How much her story resembles or differs from her earth 0 similars is unknown, same as her nature on that universe.