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GERMANTOWN - Students and parents in Germantown are dealing with the sudden death of their principal. Jennifer Semmann was the principal of MacArthur Elementary School. She died Sunday night after leaving the Packers game at Lambeau Field. This tragedy came out of nowhere. Tuesday, the medical examiner in Brown County said Jennifer Semmann may have died of a medical condition she probably didn't even know she had. School was closed at MacArthur Elementary Tuesday. Everyone's thoughts are on Principal Jennifer Semmann of Grafton, who died without any warning at the age of 43. "Jennifer was, she was just an incredible principal, person, friend," PTA President Julie Oswald said. Semmann collapsed as she was leaving the Packers game with her husband and two daughters. An autopsy found signs of a medical issue that could have caused her death. The medical examiner isn't saying what disease they found, but they say Semmann probably didn't know she was sick. She's been a well-respected principal in Germantown for seven years. "She just had a way with the kids, they all loved her. Even when they were in trouble, they didn't mind going to see her," Oswald said. Psychologists have been brought in for kids at the school, but it's a tough thing for elementary school students to grasp. "At that age, I don't think they really get the whole concept of it. They just understand she's not there anymore and that bothers them," Oswald said. Parents say Semmanns never missed a meeting as principal. "I’m honored that I got to know her as well as I did and become friends with her, and I have that to remember," Oswald said. The final cause of death will take a few weeks to determine. Germantown School District Superintendent Victor Rossetti said Semmann has a husband and two daughters. He described her as a warm woman who was dedicated to children and education. "If you would have known Jennifer, or if you would have seen her working, you would have thought, 'She's not working, she's just having fun,"' he said. "She was just enjoying herself. She loved what she did, and I think that's what made her so outstanding." Click on the link under related content to see an interview with Victor Rossetti. Ashwaubenon Public Safety Cmdr. Jim Skorczewski said medical personnel were dispatched at 10:24 p.m. When public safety crews arrived three minutes later, Semmann wasn't breathing and didn't have a pulse. Skorczewski said medical personnel faced serious challenges because of the cold. Oxygen masks and devices use to help the patient breathe froze, and rescue workers -- working without winter gloves -- lost dexterity as their fingers became numb. Skorczewski said Semmann's condition did not change while rescuers were on scene. (The Associated Press contributed to this report.)