"Left alone" is an intentional act. The mother died so unless it was suicide she didn't leave the baby alone. And then it was in the US and the US has the highest maternal mortality in the West. The headline downplays the tragedy of the mother's death, ignores the tragedy of the high maternal mortality, makes it sound a bit like she was a bad mother rather than a mother that society didn't do right by.
Edit: even a suicide isn't leaving the baby alone because if you are that far out I'm not going to hold you responsible for the baby (although if I knew you I might have a very hard time forgiving / be unable to forgive you).