While I agree that she could have probably outbraked the situation, only she had the luxury of knowing what was in her mirrors. Anchoring the brakes in a congested traffic situation is an invite for a hood ornament up your ass. Who would normally assume that brake lights in a lane next to you will result in them blocking both their and your lanes? When I first saw the movie my imagined reaction was basically what she did. Roll off the throttle, kiss the brakes and wait for the car to get itself sorted out. I've been in similar situations a few times with cars screeching to a stop, but they've stayed in their own lanes. By the time the car goes sideways and blocks both lanes, there was no way out short of laying it down. If you go to her website you'll see that she's a long time racer/rider as well as a racing/riding instructor. There were only 2 seconds from the time the car's brake lights first came on until impact. I believe she did the best she could with what she had for options.
Bret