Friends and former Brooklyn neighbors recalled Miriam Carey as a hardworking single mother who had every reason to live. “She had everything going for her,” said Yolanda Napoleon, 40. “A beautiful baby, a man helping her with her baby, a job making 100k per year. Her child was her everything.” Carey, 34, was a dental hygienist who was licensed in both New York and Connecticut. She lived in Brooklyn as recently as 2005 and had a condo in Stamford, Conn. Friends, who grew up with her and her four sisters on Stanley Avenue in Brooklyn, were mystified about how Carey’s...