The death of a woman who was found unconscious outside Glenbrook Hospital remains a mystery to police and her family.

No charges have been filed related to the Jan. 7 death of Christine M. Andalina, 27, of Glenview. Her family is struggling to understand what happened.

"We're in shock," said Elissa Andalina, her older sister.

Police responded to the hospital at about 4 a.m. after a employees noticed an unconscious woman outside the emergency room, investigators said.

Doctors attempted to resuscitate the woman but were unsuccessful.

Police identified the woman as Andalina. After examining the body, detectives saw no noticeable cause of death, officials said.

Andalina was found laying on the ground and had apparently been dropped off at the hospital, said Cmdr. Jeff Ader of the Glenview Police Department. Police are looking into whether she was with anyone else besides the person they talked to before she died, he said.

Ader said he didn't know how long she had been outside before employees noticed her. Police have been reviewing hospital surveillance video of the emergency room entrance area.

"When we got there, the ER staff had taken her inside and were working on her," Ader said.

The Glenview Police Department and Cook County Medical Examiner's Office are investigating the death.

A medical examiner's report could take 10 to 12 weeks, Ader said.

A hospital representative declined to comment, saying the matter was being handled by police.

Andalina was remembered this week as a loving sibling, daughter and granddaughter, who had her entire life ahead of her.

"She was my sister and best friend," said Elissa Andalina. "She wore her heart on her sleeve. She had a good heart and a contagious laugh."

Elissa Andalina said she and her sister grew up with their parents in Glenview. According to Glenbrook High School District 225, Christine Andalina was a member of Glenbrook South High School's graduating class of 2001.

After high school, she studied nursing and earned an associate's degree, her sister said. She worked as the head receptionist for a manufacturing company, designing the program for the relatively new position in the company.

"She was very proud of that," Elissa Andalina said, calling her sister a "dedicated, remarkable employee."

Christine Andalina was planning to go back to school to become a medical assistant or vet tech, her sister said.

"I wish we had some answers," Elissa Andalina said.