Well, this racebent, Sapphic Etta is still Etta Candy, and her being queer makes perfect sense thematically in a book where one of the title character's classic Golden Age exclamations was "Suffering Sappho!"; whether you like it or not, lesbian, black Etta Candy is still Etta Candy, period. I don't care about a Cheetah/Etta Candy romance not because I could not see Barbara as queer, but because I cannot imagine Etta falling in love or lust with a villainous woman who has given her bestie so much grief throughout the years.
There's Golden Age Etta Candy, and then there's every other version of Etta Candy.
Amy Reeder and Renae De Liz come close to the original, and Gail Simone's take does have some lesser qualities.
Etta Candy being gay makes a lot of sense, and her having dark brown skin is perfectly fine if she's written with care (because it kind of reaches the POC Alfred level of easily becoming offensive).
The main point is that Silver Age Etta Candy wasn't really Etta Candy,
Bronze Age Etta Candy wasn't really Etta Candy,
Post Crisis Etta Candy wasn't really Etta Candy
New 52 Etta Candy wasn't really Etta Candy
Rebirth Etta Candy wasn't really Etta Candy
I would have written Caucasian Etta and African-American Etta or simply Original and New 52/Rebirth Etta but I was in a hurry and I wrote original and black instead. That wasn't my intention and I wasn't trying to offend anybody. I usually use ethnicity or nationality when referring to characters (if the character's ethnic/national background is known).
In some fairness thats the Rebirth Outlaws book, which is agreed to be substantially better written than the New 52 one and quite good on its own merits (well before the Outlaws section at least)
Granted Scott Lobdell is still writing it so your mileage will vary on how willing you are to put up with a book with that guys name on it.