ORANGE ( — A Chapman University freshman remains hospitalized after falling three stories from the roof of a campus building.

“We’re so lucky that she is OK,” said Reagan Shrum, a friend of unidentified injured girl.

READ MORE: Dodger Fan Jessica Andrade Struck By Justin Turner Foul Ball In San Francisco

Shrum said her friend was trying to jump from one spot to another inside a building when she fell Saturday afternoon.

“She fell and she hurt herself mostly upper body area,” she said.

To protect her privacy, Shrum wouldn’t disclose her friend’s name. But she said the girl was on the roof of the new Musco Center for the Arts with her boyfriend when she got locked out during the afternoon performance of “The Merchant of Venice.”

A source says the couple crawled into a vent and came out into a maintenance area.

READ MORE: 101 Freeway In Hollywood Reopened Following Death Investigation

Police said the girl tried to jump over a railing to a third-floor balcony but misjudged the distance and fell to the lobby floor.

She was taken by ambulance to UCI Medical Center in critical condition.

Her friend visited her in the hospital and said she is expected to make a full recovery.

“She was doing OK. She was pretty hurt,” she said. “I’m just so relieved that it wasn’t any worse than it was.”

Police said the girl was in the maintenance area where she shouldn’t have been.

MORE NEWS: 'The Jet Man Is Back': Another Possible Jet Pack Sighting Reported Near LAX

The university said it was now posting security guards in that location during all performances.