She opted not to have chemotherapy because she was pregnant with her sixth child, and was later told the cancer was terminal.
Thirty-seven-year-old Carrie DeKlyen from MI found out she had an aggressive malignant tumour which affects the brain and spinal cord in April.
"It is comforting for us to know that she went home to be with Carrie", Nelson said.
Doctors thought that Life would have a chance of survival, but her low oxygen levels, abnormal blood pressure and rising fluid in her brain were too much for the premature baby. Earlier this summer, she had a stroke and suffered major brain damage; she was in a coma and unresponsive when she gave birth to Life Lynn. "But it was Carrie's decision, and I said, 'What do you want to do?' She said, 'We're keeping it, '" her husband, Nick, told People.
He chose the latter, and Life was born - an extreme preterm who would never know her mother.
"Carrie is now rocking her baby girl", the family wrote on Facebook. "She sacrificed her life for the child". "She said the girls" father, Nick Deklyen, is not doing well as he faces the family's second tragedy in two weeks.
She died today, just two weeks after she was born. "I have no explanation of why this happened, but I do know Jesus loves us and someday we will know why".
DeKylen delivered her baby on September 6, was taken off life support and died on September 9.
By the time Carrie was 22 weeks pregnant, her baby wasn't growing fast enough, weighing only 378 grams, or eight-tenths of pound.
"The grief we feel is nearly unbearable, please be praying for our family", he added.
Nelson says "we don't have any answers", but that "maybe Carrie needed her".
'My wife loves the Lord and she loves her children more than anything, ' Nick Deklyen, husband said the Friday before Carrie died. "She had the baby, and now it's time to go home".
Nick and Carrie shared kids Elijah, 18, Isaiah, 16, Nevaeh, 11, Leila, 4, and Jez, 2.
"She had a rough day yesterday", Sonya Nelson, DeKlyen's sister-in-law said Thursday. "She's going to be healed".
A GoFundMe page for the family has raised over $150,000.