Yeah, the game resetting your crosshair to lower is REALLY annoying. And mouse sensitivity defaults way too low to react fast enough.
Biggest gripe though is that her animations are clunky when she "lunges" out, so you can't predict her head location at all. Instead, you have to play several times, so you know where her head will be based on the animation choice - which kinda defeats the point, since now you're just memorizing spots on the screen to shoot.