Who Would Do Something Like This And Why?

What adult would do something like this woman did?  The situation started when a home owner found a toddler left at her door around 8:20 p.m. on Wednesday.  The home owner called the police and said that she heard a knock at her door and when she went to answer the door, she found a 2-year-old boy standing there with no adult.  Take a look at the video.  Once the woman gets to the front door, she rings the doorbell, knocks on the door and then RUNS back to her vehicle, abandoning the 2-year-old child and two bags she was carrying. The entire incident lasted 23 seconds.