UPDATED: Here's Mom. Her name is Ashly Duchene, and she's been arrested on suspicion of negligent homicide. From the police spokesman ...
Tranter said interviews with family members and close friends revealed that Duchene was an unhappy mother. Those close to Duchene said she wanted her freedom and did not make the child a priority at all, Tranter said.
I went ahead and changed the headline since it's still not clear if this was definitely an accident or not. Thanks to everybody who pointed this out.
PREVIOUSLY: Sad story from Phoenix, where a 17-month-old baby died after his Mom forgot to leave him at daycare before she went to work at Hooters, police say. The baby died in the backseat of his mother's Honda Civic.
Hat Tip: Thanks, riskybzns and eephus!