Her accent was just fine....
It was her acting BEYOND the accent that left much to be desired. Like, when she ordered Adrian Brody out of her home. Up until that point, I thought she was doing pretty well; then..."You get out!!!"
I cringed. For me, It fucked up everything past that point, even though she was, objectively, fine for the rest of the movie.
I want to see her try an American accent again, for something more light-hearted.