Did you miss Eyes of the Gorgon, Mission's End? Or even the Messner-Loebs run, where she ended up homeless and had to work at a taco stand?

You mean the issues which had no ongoing impact on her actual story. Diana goes blind for 5 issues, oh but her other Amazon senses mean she can still fight as well as if she could see.

As for Diana becoming homeless, she was never homeless. She loses Paradise Island & is then immediately offered a place to live.

Not to mention she did die as well and had to have her mother had to fill in for her for a while.

Are you talking about when she reverted to clay for that one issue, that had no ongoing impact before immediately being turned back?

DC consistently drops the ball on promoting Diana

No not promoting: WRITING. They drop the ball in WRITING Diana, because they forgot to add an exploitable status quo to the character after the Crisis. An they refused to allow any writer to come along & do it afterward: There are heaps of half assed attempts as new writers tried to add new spins to the character, but none of them stick because WW needs a back to the drawing board approach, where the character can be properly defined & set loose on the DCU. They tried that with the NU52 version alas what they came up with is essentially a Neil Gaiman-esque urban fantasy in hiding version of the character, something that is going to age very badly, like Rocket Racer or the Hypno-Hustler.

But that would interfere with your narrative of immunity by gender.

Except it doesn't, it actually goes to demonstrate my point. Every other member of the JLA has had major upheavals, with lasting effects, EXCEPT Diana. She gets plot immunity by gender, plot immunity by gender other female characters could only wish to have.