NEW YORK — In August, in Molly Seidel’s third marathon ever, her third-place finish in Sapporo, Japan, made her just the third American woman ever to win an Olympic medal at the distance, and the first in nearly two decades. Seidel has long been marked as a prodigy. In 2015, she became the first woman ever to win the individual national title in high school and college cross country. In between those peaks — and during them, she said — Seidel managed obsessive compulsive disorder, depression, anxiety and disordered eating. She first sought treatment in 2016, skipping that year’s Olympic Trials…
