But last month on June 25 she and her businessman husband, John Falconetti celebrated the birth of their first daughter, Sterling Diane.
Speaking for the first time since unexpectedly becoming mom for the second time Ms Miller, 36, told People magazine: ‘She is our miracle daughter. She is such a blessing.’
The seven-time Olympic medalist, who dominated her sport during the Nineties, was diagnosed with a malignant tumor on her left ovary in February 2011, just 14 months after welcoming her son, Rocco.
She had hoped to expand her family but was forced to put her baby plans ‘on hold indefinitely.’
‘Instead of calling my parents to tell them they had another grandchild on the way, I was calling to tell them I may have cancer . . . My world stopped,’ she said at the time.
The Florida-based, retired athlete underwent immediate surgery, but when doctors removed the baseball-sized cyst along with the ovary and fallopian tube, they discovered it was a higher-grade than originally thought.