By ANDY NEWMAN Rachel Apa’s mother was waiting for her at Mile 25. It was Apa’s first marathon. She was 24, an athlete, a former Division I field hockey player at Bucknell University. She had trained for this race, the New York City Marathon, for months. At Mile 14 on Sunday, Nov. 1 in Queens, Rachel’s mother, Michelle Apa, had taken a video of her daughter, all smiles, flying by in her light green top and shorts, high-fiving toward the camera. Then Michelle Apa headed to Central Park, toward…
