When her youngest daughter, Naomi, was in middle school, Ellen watched the teen disappear behind a screen. Her once bubbly daughter went from hanging out with a few close friends after school to isolating herself in her room for hours at a time. (NPR has agreed to use only the pair's middle names, to protect the teen's medical privacy.)
"She started just lying there, not moving and just being on the phone," says Ellen. "I was at a loss about what to do."