She was diagnosed with non-Hodgkin lymphoma in 1999, shortly after her father, Hockey Hall of Fame broadcaster Gene Hart, had died from cancer.
"I guess in a weird way the fact that it was so close together, we didn't have time to think," she said. "We didn't really have time to grieve my dad and grieve this illness I was about to challenge. There was no other way to go. It kind of kept us together as a family."
Gene Hart broadcast Flyers games on radio and television from the franchise's inception in 1967 through the end of the 1994-95 season. Lauren Hart grew up viewing the organization as a second family, and that family was there for her in her time of need.
"The first person to call me [after her diagnosis] was Eric Lindros, and he said he had heard I had some news and he wanted me to know that everyone was behind me and everyone supported me," she said. "And then player after player called. I knew them, but I didn't know them that well. I had been singing for a brief amount of time. It was pretty spectacular. Then halfway through my treatment [founding owner Ed] Snider and his wife and the guys showed up at my house and threw me a surprise party when I was halfway through. That was incredible. What a morale booster.
"I kept coming here to sing all during treatment, in all my bald glory. It kept me going. It gave me something to look forward to. It made me feel relevant. I had a big record deal [with Columbia Records] and I was touring and I was into my art. When people found out on that end, they weren't so keen on having me around. But everybody embraced me here. It meant everything to me."
She got another surprise in her first game after her cancer diagnosis became public. After finishing the anthem, Flyers coach Roger Neilson was waiting behind her in the Zamboni tunnel to greet her with a hug.
"I remember like it was yesterday," she said. "He ran off the bench, came all the way around to the tunnel and said, 'I'm with you, we're all in this together.' I don't know how to put into words what that all meant. It's so powerful."
Hart rarely missed a game during six months of chemotherapy, and she has been in remission since 2000.
Since then, she has tried to repay the support she received by helping other families in the same situation.
"Any fan that ever calls me or writes me, I will show up on your doorstep, I will come to your hospital room, because it means that much," she said. "That's what helps people get through."
One of those families was the Sniders.