That video did surprise me, but it wasn't a shock.
Many Chinese have expressed the opinion that Chinese law is so backwards and corrupt and the Chinese people themselves so immoral and treacherous that they would fear to help anyone in need lest they be turned on and held financially responsible for the incident by the person they helped – as has in fact happened in several widely reported cases.
This is probably the biggest reason that people ignored her. I lived in China as a kid and no one gives a shit about helping strangers because of cynicism. I remember walking back home from boarding school when I was four and seeing a bloody brawl where two people were going at each other with bricks with a little boy with blood all over his head crying in a corner while the crowd just watched it happen like a cock fight. Drastic differences in cultural and ethical standards compared to western countries...
Edit: The comments posted in the youtube video were just as sad. There is a lesson to be learned form them as well.
"The Chinese seem to me to be less than evil, they are base. The Chinese are monsters without souls. Naturally, they don't realise this themselves, they think they are normal human beings. But they are not. Perhaps they are even  puzzled by the world's reaction to this video. One thing is for sure, we in the West have nothing, absolutely nothing, to learn from China, you can keep your filthy despicable "culture" and "values", such as they are, to yourselves."
Other comments include:
-Communism is the root of all evil
-Chinese people are like Nazis
-This is what happens when you ban religion in China
Reading these comments disgusted me just as much as the video itself. I find it pathetic that people are bashing all of China for this incident while it was clear that the reporter, parents, and millions of other Chinese are outraged at the incident.