OMAHA, Neb. (AP) — The family of a 16-year-old girl who died after fainting on an Omaha school bus says she had a heart problem.

Her cousin, Nancy Gutierrez, said school officials have shared preliminary autopsy results with the family. Omaha South officials say doctors found fluid in Graciela Cabrera’s heart and sent it to a specialist for further investigation.

Gutierrez says the evaluation’s results will be returned within 30 days.

Cabrera fainted on the bus Tuesday and first responders found her unconscious and not breathing. She was taken to an area hospital where she was pronounced dead.