The difib is not a magic machine. It doesn't work like on TV, where you just shock 'em back to life. It's slightly better than nothing, but not much.
This father's belief that his daughter would be alive if only the mall had been quicker to respond with the defib is not based in reality. Five units in a place as big as a shopping mall means you are talking about a ten minute response time, even if everything goes perfectly.
I know it sounds harsh, but shocking that girl after 10 minutes down was not going to make much of a difference.
Not only that, but this girl was 18. I doubt anyone even thought it was her heart.
Now if a 70 year old mall walker had gone down, hey probably would have tried to zap her.