Braylynn was diagnosed with a brain tumour on December 6. Her situation became complicated a few days ago and she has been in hospital since. The family has been told she has hours left.
Mother Ally Parker, from Florida, is preparing to say goodbye to both her father and daughter within what could be just weeks of each other.
"In a few days I will have to bury this beautiful little girl," the mother posted on Facebook.
"Months, maybe even weeks, later, I will have to bury my father," she added.
"Both of my heroes, gone, within the same year.
"How could this happen to us? What did any of us do to deserve THIS?
"Why do they have to leave us? What are we supposed to do?
"I refuse to believe that there is a reason for this.
"This world is a terrible place."
Little Braylynn suffers from diffuse intrinsic pontine glioma, considered the most deadly form of brain cancer. It has no cure and no survival rate.
Her mother says she is keeping her on the ventilator until funeral arrangements are finalised.
