I firmly believe that Etta should be a college student at Holiday university (or whatever the school was called). And once the narrative unfolds some and she graduates, she should be a professor at the same school.

I think Diana's ties to the military offer a lot of ground to work with and an easy way to introduce story hooks, but not everyone in her world should come from the battlefield or Olympus and Etta is a fantastic way to bring some "normal" people into Diana's life and keep her grounded. And she's of course a great way to explore women-centric social issues.

And you're right; Etta (proper Ettas, not the weak sauce Amanda Waller copies) has mountains of personality. Hell, basic Etta has more personality than virtually any other supporting character in DC not named Lois Lane or Jimmy Olsen!