ST. LOUIS - At St. Louis Children's Hospital, they know the best medicine doesn't always come in a bottle.

Fourteen-year-old Rosalie Albright is back for another check-up.

"We have spent a lot of time in hospitals," says Rosalie's mom, Aimee. "We have had nurses tell me that I should have an honorary nursing degree."

What she's been through has almost been enough to stop the music. Ever since she was a little girl, Rosalie has expressed herself through song.

"It's what she loves. She loves to sing. She loves to dance," her mom says.

Singing isn't easy when you have cystic fibrosis, a disorder that affects the lungs and makes it difficult to breathe.

"Kids can be quite functional and doing fine," explains Dr. Pirooz Eghtesady. "They get an infection and after the infection, their ability to function deteriorates and is not the same."

Rosalie powered through appearing in one musical after another.

"I would have to pick sometimes what scenes I could be in and which ones I couldn't because I would get out of breath," she says.

"During shows," says her mom, "we had oxygen tanks and the chairs in both wings so that she could get off the stage, sit down get the oxygen on and recover."

Then life hit a sour note. Rosalie was told that her lungs were failing and she needed a transplant but before surgery her doctor made her an unusual deal.

"If he gave her the new lungs, she had to sing for him," says her mom.

"That was a way to see the sparkle in her eye," says Dr. Eghtesady.

Fast forward a few weeks and the stage is set. She told us she was feeling much better which was music to a doctors ears.

As soon as Rosalie is able to return home to Indianapolis, she is scheduled to be in the cast of 'Shrek the Musical' at her neighborhood theater. And in one of the examining rooms, she belted out the song "Donkey Pot Pie" from that musical for Dr. Eghtesady.

The road to recovery is still a long one but the prognosis is good.

"I can't help but think the fact that she has such strong lungs if you will coming into this in many ways with her ability to sing and belt it out that it's going to help her," says Dr. Eghtesady.

A young performer on her way back to center stage with the power of music and medical science in perfect harmony.