According to CBS News:
The 28-year-old teacher at Independence Junior High in Palos Heights was taken to Illinois Masonic Hospital. She was kept alive until Tuesday so that doctors could harvest her organs for donation, family members told the Chicago Sun-Times.
The incident happened before the game started. She was given CPR at the field and then transported by ambulance to Illinois Masonic.
“The Chicago Cubs are saddened to hear news of the untimely death of Maureen Oleskiewicz. We express our deepest sympathy to her family and friends. We will continue to keep her family in our thoughts and prayers during this difficult time.”
Our thoughts and prayers are with the Oleskiewicz family.