Trying to think of female examples that aren't part of a couple, the closest I can come up with is Gwen Stacy, Spider-Man's second girlfriend. She got killed by The Green Goblin in 1970. (The Green Goblin died in the same fight.) Then there was a clone of her shortly after, but the story decides that a clone should be considered a different person than the original, even though main characters running around in clone bodies is pretty common in comics, so anyway the clone doesn't count and Gwen Stacy is dead. It does motivate Spidey, so it's pretty important. It's also one of the best Spider-Man stories ever, if not the best. The first Spider-Man movie is very closely based on it, except they call her MJ and she doesn't die.
Oh yeah, The Flash's wife, Iris West, also got killed back in the '70s. But by the time Simone was complaining, in the '90s, they had revealed that Iris was actually alive but transported 1000 years into the future (where she was born, which was established a few years earlier). By the '90s, Iris was alive again and it was The Flash, Barry Allen, who was dead, and his death was used as motivation for the new Flash, Wally West, who had like ten years of stories about how he is motivated by Barry's memory.
Also, there was an instance of a character called Arisia Rrab, Green Lantern Hal Jordan's one-time orange loli alien girlfriend (also a child, so he is a child molester), who, after Hal became evil, was stranded on Earth. The same supervillain who killed Alex DeWitt and stuffed her in a fridge then killed Arisia and stuffed her in an oven. Though he was originally Captain Atom's nemesis, now his gimmick was killing Green Lantern's girlfriends and stuffing them in kitchen appliances. Anyway Arisia got better eventually, her Green Energy-infused body was used as a battery or a transformer or something by the Manhunters, robots who preceded the Green Lanterns but turned evil, and are powered by Green Lantern energy. Running the energy through her body, combined with her alien physiology, allowed her to heal and come back to life. But to be fair, that was after Simone's article.
So anyway in the '90s Simone got hired by DC to actually write comics. Her hatred for DC, baselessly, ridiculously, calling them sexist is what got her her job. She found success with series like Secret Six and Birds of Prey, but of course she inserted SJW shit into them over time. She gets credit for making people actually like the character Catman, for example, but that was only so she could make him gay with Deadshot later.
Now as for Devon Grayson, let's start by pointing out that that's not her real name. The original Robin's name is Dick Grayson, and Devon changed her name to his last name. As she tells the story, one day she was watching Batman: The Animated Series and decided to just call up DC Comics on the phone and ask for a job. And she got it. To this day she goes on the internet and runs her mouth about "male privilege." Anyway, she got a job writing Nightwing, which is what Robin calls himself after he grows up. The notable thing she did while writing the series was create a character called The Tarantula. Well, she didn't create it, there was already a Tarantula. She made a new one that was a girl and took up the mantle. Then Devon Grayson had this new Tarantula rape Nightwing. When called out on it on the internet, she claimed "it's not rape, it's just non-consensual sex." Devon Grayson isn't as successful as Gail Simone, but she still gets work to this day.
I go on this tangent because this is how cucked comics already were in 2011. Now SJWs were targeting it to make it even worse. People would post articles from comics websites, which were already SJW, on /co/, and /co/mrades would rage. See, after the bronies, /co/ was no longer love. Their patience was spent, and they were now on a hair trigger. Then people would start posting these SJW articles deliberately for the rage. They found this was an easy way to troll /co/. But soon enough actual SJWs started showing up, seeing the trolling, and thinking they were in good company.
Just like the bronies, the SJWs took over /co/, then spread to the other boards of 4chan, and as we all know, eventually moot decided to cater to them instead of his actual audience. And now we're here. Yet for some reason the SJWs still followed us to 8chan, and /co/ continued to be more SJW than the rest of the site, even if not as much as it was on 4chan. And now we're a few 8chans in, and they keep following us, and again, though it's not as SJW as it is on 4chan, this /co/ remains more SJW than the rest of the site. This /co/'s board owner will ban people for pointing out shows he likes doing blatant SJW shit, for example. You can get away with more complaining than on 4chan, but it's still worse than the rest of the site.
Sorry this took so long. I started writing this but had to go do IRL work. History of 4chan had to wait.