Her acting is painful to watch.
Either that; or she was horribly miscast.
She did not emerge as a tough character, and seemed more like a little girl "playing hero", than emerging as a hero.
I felt her character was not only being spoon-fed as a heroine, but more like forced-down my throat. Kind of like a facehugger forcing an alien embryo down my throat, but worse.
Later on, I felt sick to my stomach watching her performance and listening to her "tough voice" one liners.
If they want a lead, regardless of gender, hero, they need to seem tough. We shouldn't have to be force fed convinced of it.