Controversial opinion.. but I'd like to have actually seen Kara with Darkseid in an actual consensual relationship and leading his Furies. Or at least have a story like that story given much much more time than it was. No idea why, but the thought of an "evil" Kara, leading the furies and knowing what chaos she could sew before ultimately deciding to help the 'good guys' and taking up her mantle as Supergirl once she decided to stand for hope rather than conquest would have been a nice twist on the story. Also would create some major dynamic differences between her and Superman, as she would have a different side to her, a dark place she has and could go to which Clark himself tries his best to avoid(although has had many elseworld stories where he hasn't). idk I just felt like it would have been something nice if not interesting to have added to her character.
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I've heard the Red Lantern story sort of does something like that, but I haven't had the time to check it out.