The declination did not say that, read it again. It says the only violation possible was a speed violation, but it couldn't be shown. It also says they can't show she acted negligently, and both of those things are necessary.
Oh, my bad. You're right: it didn't say she was.
But seriously, after looking at the video and in light of the skid marks, you think she was driving reasonably? Because that's the crux of the charge.