44 years ago - Valentia Vostok is born in Russia.
38 years ago - 6-year-old Valentia immigrates to America.
26 years ago - 18-year-old Valentia becomes a combat pilot.
22 years ago - 22-year-old Valentia becomes the pilot of the new Quad-Fusion fighter.
17 years ago - 27-year-old Valentia absorbs Larry Trainer's soul self when his body is destroyed, leaving her in a coma.
13 years ago - 31-year-old Valentia is found by Arani Desai and recruited into the new Doom Patrol as Negative Woman.
9 years ago - 35-year-old Valentia, clearly suffering as the host of Larry Trainer's soul-self has it extracted from her, ending her time as Negative Woman.
5 years ago - 39-year-old Valentia becomes an operative of Checkmate.
Valentina Vostok's main defining character trait, beyond being cursed with a radioactive body caused by her disassociated soul self, is the fact that she's a Russian fighter pilot that defected to the US. I actually had no idea if that was still possible, but after a little judicial googling, we've determined that defection is only possible when the country in question doesn't allow it's people to emigrate. Obviously, that's no longer true of Russia (or at least it is as I'm writing this), so we're deliberately rewriting this part of her story. Now, not only had she emigrated, she emigrated when she was young enough that she could have become a combat pilot within our own military.
(Obviously, we've created a timeline question ourselves. As of right now she COULDN'T have emigrated 38 years ago. At the time of this writing, that would be 1977, and the Soviet Union was still a thing then. Still, rather than worry to hard about how our '# years ago' system lines up with actual dates, we're choosing to just write the stories in a way that makes sense and rely on history to sort itself out.)
Meanwhile, Valentia was a part of the second doom patrol, a group that never really gained a huge following. While her soul self was never described as being an extension of Larry Trainor, the concept was immediately picked up later on, and opened up the character to all sorts of interested explorations into the nature of identity. Valentia, for her part, got to go on to be a major player in the spy organization Checkmate, and while we're definitely honoring that, her skill set is more suited for her to be a field agent rather than on of it's leaders.