It happened here in Ohio and Phyl is correct she had been "warned" several times before not to leave her child in the car unattended.

I have 4 kids and NO WAY...as freakin busy as I am.....would I EVER forget a child in my car!!!

While the woman is indeed suffering a fate worse than any court could give her...IMO, she should have been charged with something......given an animal in AZ seems to be more important enough (than a human being) to prosecute the owner of the dog.
Becki~