I wonder if people are just sympathetic because she's a mother. If it was a father or a babysitter in this story that the exact same thing happened to, would you be glad they aren't pressing charges?
There's already a story posted in this thread about a father doing the same thing... same sympathy.
Babysitter I wouldn't have as much sympathy for. Reason being is their one and only job is to take care of the child.