Negative Woman is Lt. Col. Valentina Vostok, a Soviet pilot who was fused with the energy that created Negative Man. The negative energy gave her several powers including
Negative Man (Character) - Comic Vine
Negative Woman: Valentina Vostok
Back Issue #65 by TwoMorrows Publishing - Issuu
DAMN Good Coffeeand HOT!: February 2018
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Negative Woman (Earth-16), DC Database
Negative Woman - DC CONTINUITY PROJECT
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Valentina Vostok (New Earth), DC Database
Valentina Vostok (Character) - Comic Vine