She is 100% aware of exactly how horrible of a person she is, and she fucking loves it.

I don't think she is. Watch for my hands.

You are JKR, at first a pretty average liberal brit turned a model successful women with years onto years of international fame loved by children around the globe. At the same time you got yourself into pretty traumatic relations that later made you more aware of feminism, and feminists did start to circle you, but the ones who are in your current circles were, ehm, not based. Rich women, who only cared about advancing their position in the conservative society but otherwise happy with how things worked - that's pretty how it felt in HP world too, where mages were part of aristocracy and Hermione was plugged in as a person joining the blood-defined class from the outside without changing it, by pulling up the bootstraps, the JKR vision of feminism. When Granger changed her attitude to something other than 'fuck you got mine' and started to vouch for the freedom of slaves defined by their race, house elves, she was looked down by JKR for qustioning the established order too much and probably hurting the privelege mages have.

I don't think she formed her thoughts at the time of Twitter drama, but mean internet people and then celebrities pushed her deeper into her terf circle where she, by now, felt at home. She was not losing the plot calling trans folks names, she was consistent in her belief that she deserves the exclusive privilege, a prodigy like Hermione, and she hated that there were people shattering the conservative framework of gender, moreso her little bit of misandry made her specifically ballistic about transwomen. All these years she was told she's crushing shackles of the vaginal tribe and now what, penis-havers can inlist too?! And, what's insane, she is no more a progressive darling because these people are more edgy than her?

The privelege of being a successful woman, a radical statement in a flesh, praised by her TERF friends, got shattered. And for the first time ever, she got jumped by the Internet that previosly put her on a pedestal. She is now a victim, and being disinformed by her circles, she sees it as a crusade of her privelege, of her mission to make women the first class citizen, by no one else that transitioning men! Oh the woes of liberal woman!

And the ones left to praise her as she deserves are right-wing douchebags, making her drift even further, into writing a book about an evil crossdresser and causing most of the cast of HP, who were pretty neutral at this point, to turn on her too. Was that a hit of people who were always jealous of her? Did she became a scapegoat for a culture war of the wokes her friends told her about? Was she hated because of what she achieved being a woman? Does it mean everything she built was falling apart as these non-menstruating women were marching on? She stopped to care, and as the thick skin of her riches allowed her to, she kept earning her bucks while keeping the low profile not to hurt her main source of income. It hurt her to lose the popular vote, the image of the uber femme she cherished, but as long as she is mute, she could keep her privilege and status she longed for signing the first book into the print.

Her fixation on herself being further enabled by rich TERFs around her could make her feel herself anything but Voldmort, maybe Hermione or initially loathed by many Snape, who does the right thing from behind the scenes. This is rare for real villains to be completely self-aware of their vallainry. Even Hitler, who wanted to enact the Nero plan and burn down Berlin to ashes felt like he was wronged by the germanese he wanted to thrive, and I believe Mommy Ro doesn't consider herself wrong for being a vocal transophobe but a bit wrong that it came out like this leading to her distress and meltdown.