Good point. But, you know... it's cinema. Let's be expressive here. You are probably right but I've replayed it 2-3 times and I still have a hard time with that scene. That and the fact that, a few moments later, she didn't move an inch when Eddie was morphing (for what seemed like forever) in front of her.
I think it's weird to give a main characters that kind of lack of reaction. Especially in a movie like this.
Same, I felt jarred by that scene. She felt as much emotion as seeing her dinner slightly overcooked in the microwave as the shock of seeing her best friend dead without so much as a heads up that people have been killed there or even that her best friend was in the area.
Then as you say the whole transformation she just stands there without any survival instincts to flee.
Glad to see I'm not the only one who thought that. 👍