But it didn't take, the family revealed later. For several days, a machine kept Sarah alive.
She got another chance in the form of a second lung transplant, which again came from an adult.
Speaking more than two months after that happened, Janet Murnaghan said "the lungs are doing fabulous."
"She's weaned off the oxygen," the mother said. "But she has the tracheotomy, (which) is helping her breath... They just can't do it by themselves yet."
With her discharge and ambulance ride home from Children's Hospital of Philadelphia, Sarah is back where she belongs. But it's not like things are all of a sudden easy for her.
She still has trouble walking, relying on a walker to move. She will head off to rehab several times a weak.
But Sarah will also start school -- from home, initially -- the week of Sept. 9. If all goes well, things will keep on progressing, says her father, Fran Murnaghan, who adds hat the goal is "getting more back to regular life.
"Each day, she gets stronger," he said. "We'll be doing more and more normal things."
Given all that she's gone through, for Sarah, doing "normal things" will be an extraordinary accomplishment.