Seems Ben Mendolsohn has the same accent affliction that Elizabeth Olsen had where he slowly reverts back to his native accent. He's just full on Australian now.
Also, do we think Fury knows his wife is a Skrull? On one hand she shifted before he could see her, but on the other she was the one who introduced him to Gravik. I think he does know which would explain why it's so personal to him to fight the war.
I thought he knew as well, but I don't know why she would shift before he saw her if she did? Seems strange that she was comfortably in her own skin cooking then suddenly he shows up and she put on a different face...
I'd like to think she's comfortable both ways and it's just situational.
It's like how you might act differently around different friends or your SO. You don't necessarily prefer one or another. In fact, it's nice to have different people you can interact differently with.