A Florida mother who police say was fatally stabbed by her 17-year-old son on Sunday posted lyrics online taken from Taylor Swift’s song "It’s Time to Go" in a haunting final message just hours before she was killed.Catherine Griffith, 39, uploaded an image of a remote footbridge leading into a forest captioned with the lyrics to the song the day before she was killed in the vicious knife attack in Auburndale.Witnesses say she and her son, who reportedly has a history of mental health issues, had gotten into an argument outside his grandmother’s home. He then dragged her by the hair