A tragedy unfolded in the Chicago suburb of Bloomingdale last week. A 43-year-old woman, said to be suffering from post-traumatic stress disorder and depression, killed her 4-year-old daughter and tried to take her own life. Reports are sketchy, but it seems the girl was the youngest of the woman's three children. The older two had been the subjects of protracted custody battles that authorities believe contributed to their mother's mental state.