Keinymar Avila, a tiny 7-year-old with microcephaly who has never been separated from her mother, curled up in the arms of a woman she’d recently met. Her mother, Yamile Perez, glanced over at her daughter to make sure all was well as she attended a virtual meeting with Chicago Public Schools officials who were evaluating Keinymar’s needs. It is not easy to let someone else hold your child, ...