The police are calling this a fall, not a hit-and-run.
Now, I am a cyclist, I have been in a few good falls before, it is hard to believe that this could be anything but a hit with those injuries. Worst fall I have had to date, 10mph, front tire slipped into grove of train track at a ~45 degree angle to road while raining. Damage was more to me then bike, minor concussion, scrapped up left thigh, calf, and arm, and both palms (even with gloves on). Based on what is being said (we all know how reliable that can be), she would have been travelling at roughly the same speed or less. I am no where near as experienced as Susanna Schick. I wasn't there so I can say more then my own opinion.