Whitewash Me Twice, Shame On You...
"Paint my face in your magazines
Make it look whiter than it seems
Paint me over with your dreams
Shove away my ethnicity"
- Nelly Furtado
Uh, DC? Specifically, the editors of JLA?
Unless that whiny emo-boy Superboy-Prime punched a hell of a lot of walls, Vixen is not white!
Sure, she's a model, but last I checked? Not white. I've seen her in comics all the way back in the 80's ranging from the Detrout-Era JLA to Suicide Squad and even modern comics like Birds of Prey (which was drawn by your current artist). She's not white. Trust me.
It's bad enough you made this mistake once recently.
If your colorist were to make Superman's skin green or Wonder Woman's skin brown without explanation, would you just leave it there? Of course not.
Vixen deserves the same consideration.