Athena Strand’s mother wore all black as the 7-year-old’s heartless killer was sentenced to death — one of the rare times during the disturbing case that she didn’t wear pink, her late daughter’s favorite color. Maitlyn Gandy donned the somber outfit as Tanner Horner was sentenced to death in a Texas courtroom Tuesday and sobbed as the court learned he would die by lethal injection at a later date. Gandy’s hair was still dyed the same vibrant pink it’s been since her daughter was brutally murdered in Nov. 2022, but the all-black outfit stood in stark contrast to the hot pink suits she’s been seen wearing in the gallery during nearly every hearing since Horner was arrested and charged four years ago. Maitlyn Gandy wore all black to the sentencing, a stark contrast to her vibrant pink suits throughout the trial. AP Gandy wearing a pink suit as she sobs through testimony at the trial of her daughter’s killer in April.…