>>101104007There are flashbacks (I think they're flashbacks. Reality is so mutable in BH that I'm never sure.) where she announces she's hanging up her cape and retiring.
She flies to the skyscraper headquarters of "Lex Luthor" (except this one really does seem to have reformed after years of super-villainy), turns back into the old lady, announces they're soul-mates and are going to spend the rest of their lives together. (Her life, anyway. The villain doesn't age.)
Then The Event happens, the battle with Darkseid/Thanos/Anti-Monitor. The heroes win -- but the next thing they know they're trapped in rural dullsville and she's stuck as Mary Marvel.
So, even when she HAD a choice, she preferred being an old bag!