Every major arc should end with Diana convincing either her enemy or an enemy's lacky/mook/partner to ally with her instead of her enemy. It may end with a redemptive death, but if you state it clearly like that, maybe people will start to GET IT.
And, sure, Diana would treat working fast food like that. But it's still immenselySTUPID that she's working fast food. This would work as a Donna Troy plot, not a Diana, Princess of Themyscira plot. You'd think, as royalty, she'd have access to some resources. Sheesh. She can fly with super-speed, and walk through dimensions. WHY DOES SHE HAVE AN APARTMENT IN MAN'S WORLD WHEN SHE CAN FLIT BETWEEN HER HOME ISLAND AND THE REST OF THE WORLD?