She had no pulse for 45 minutes. And she survived. Her doctor calls it 'a miracle'.

Ruby Graupera-Cassimiro's family had said their final goodbyes. The doctors at the hospital where she had just given birth said she wasn't going to survive. She had no pulse. They had tried to revive her for three hours.

But she wasn't dead. Now the mother-of-two is at home with her newborn. And, incredibly, none the worse for her near-death experience. One of her doctors, Jordan Knurr, tells Carol it was "a miracle."

Just a few minutes after Ms. Graupera-Cassimiro had given birth in a routine C-section at Boca Raton Regional Hospital in Florida, she was taken into the recovery room. That's where, suddenly, the crisis hit.

"She went from speaking to being completely unconscious," Dr. Knurr explains. "From talking to not breathing."

Doctors from all over the hospital rushed to the patient to try to revive her. She was having a rare amniotic fluid embolism, which blocks the heart from pumping blood. It is almost always fatal.

The medical team gave her oxygen and CPR. They did everything they could. After two hours of trying, they called Ms. Graupera-Cassimiro's family in to say their final farewell.

"It was unbelievably, horribly emotional," Dr. Knurr says. "Her mother came in, her sister, her husband and her son, all at the same time. They were screaming prayers and not ready for her to go. The grandmother was saying 'Take me instead.'"

When they left the room, the staff was about to stop their resuscitation. Ms. Graupera-Cassimiro had had no pulse for 45 minutes. Then it started again.

"It's just not seen," Dr. Knurr said. "It's a miracle."

Ruby Graupera-Cassimiro (Photo: Facebook)

The doctors began to resuscitate her again.

"She wasn't out of the fire yet," Dr. Knurr explains. "Throughout the night she regained everything. All her faculties. She could move all her limbs, could talk to us. She made a 100 percent complete recovery. It's just a true miracle."

He says none of his colleagues have seen anything like it.

"Usually, this is fatal. And, if someone survives a resuscitation as long as this there are usually complications or problems."

A few days ago, Ms. Graupera-Cassimiro returned to the hospital with her baby daughter, Taily.

"It was very emotional," says Dr. Knurr. "It was a life-changing experience for everybody."