Surgeons did the best they could - but eventually they had to remove her foot and the lower part of her right leg.
Milly-Anne spent Christmas in the hospital following the attack at her home in Northamptonshire. Learning how to walk on crutches, she refuses to feel sorry for herself.
"Everyone calls me a little soldier and everyone says I'm brave - I don't feel brave, I just get on with it and keep smiling," she said.
In the attack, her dog attempted to bolt out of the house in Long Buckby when the front door was left open. The family pet latched on to her leg and didn't let go.
"I remember my whole body shaking, I was hugging his back and saying: 'It's only me, Rory,'" she told reporters.
Milly-Anne's brother eventually managed to pull his sister away from the dog and shut her in the living room for safety. Rory attacked a second time; this time biting the little girl's other leg.
She was rushed to hospital where surgeons battled for two hours to save the young girl's damaged limb. Her injuries were too severe and her mother Paula Warren was asked to give her permission to amputate.
Milly-Ann's 32-year-old mom was at work at the time of the incident and had left son Braydon, 15, the eldest of her four children, in charge in her absence.
She now says she blames herself for not being there when the dog attacked her daughter, described her horror upon seeing the damage to Milly-Anne's leg in the wake of the incident on December 19.
"It was just gone, it was just a piece of bone," she said.
Mrs. Warren says that the dog, which has since been destroyed, had never shown any signs of aggression before the shock attack just days before Christmas.
Milly-Anne will be fitted with a prosthetic limb when her leg is fully healed.
She has kept a diary of her recovery on Facebook and even has a new pet, a kitten she has named Jazz.
(Catholic Online - Jan 17, 2013)
