With other children bleeding around her, Alana Merrigan called her mother, Teresa, from inside the wreckage of a bus on Soldiers Field Road to tell her that she was in “stable” condition.

The 17-year-old, from Levittown, Pa., suffered a concussion and ankle injury when the bus she and 42 other Pennsylvania students were riding on crashed into an overpass Saturday evening, shredding the top of the vehicle and injuring 34.