When she was told that a tube was helping Millie breathe she became hysterical.
She said she had asked Millie's mother when the toddler had last been well.
The jury watched doctors and nurses rushing to the room where they attempted to resuscitate Millie.
Earlier, Mr McCarney's barrister said she accepted that Millie's injuries had been deliberately inflicted.
Ms Campbell said both women were extremely distressed that someone could have harmed Millie.
She said the night before Millie was taken to hospital the toddler had been fine.
Her 27-year-old mother, from Main Street in Kesh, denies wilfully neglecting Millie and allowing her death.
Mr McCarney told police that night Millie was "dopey with a real bad dose of flu".
She said that, up until the night of Millie's death, she had trusted Barry McCarney "100%".
She was asked about a bruise seen on Millie's head in a number of the photos.
Ms Martin also said Millie had begun to cry whenever she said good night.
BBC: Millie Martin trial: Mother sobs during court questioning
Rachael Martin is accused of allowing the death of 15-month-old Millie in 2009, which she denies.
BBC: Millie Martin trial: Mother sobs during court questioning
"If it would have triggered anything at all Millie would still be here, " she replied.
BBC: Millie Martin trial: Mother sobs during court questioning
Millie's mother, Rachael Martin, was cleared of allowing her daughter's death, and cruelty through wilful neglect.
Millie died in December 2009 after McCarney brought her to hospital in an unconscious state.
An inquest into Millie's death was opened and adjourned until April while investigations are carried out.
"Millie will always be missed and she will certainly never be forgotten, " they said.
The trial has begun of a man accused of murdering Enniskillen toddler Millie Martin in December 2009.
Barry McCarney, 33, from Trillick, is charged with murdering the 15-month-old Millie Martin in Enniskillen in 2009.
Enniskillen toddler Millie Martin was brain stem dead almost the moment she arrived in the Erne Hospital.
She later told the court she had no reason to suspect that Mr McCarney was abusing Millie.
When she brought Millie to her mother's house she said her daughter's condition had them in tears.
Instead, they have established Millie's Trust charity to pay for parents to have first aid lessons.
The trial had previously heard that Millie had suffered 11 broken ribs about four weeks before her death.
Millie was brought to the Erne Hospital by Barry McCarney in a lifeless condition on 10 December 2009.
The prosecution alleges Millie suffered fractured ribs some of which were caused about four weeks before her death.
His wife, Millie Chu-Baird, is Chinese-American but can't read or write Mandarin, having grown up in Columbus, Ind.
Josephine McCaffrey said when she arrived at Mrs Graham's home, Ms Martin was in the house with Millie.
She said Mrs Graham had recalled lifting Millie and the child had winced and said "sore, sore, sore".
Millie Thompson died after she became ill at Ramillies Hall School and Nursery in Cheadle Hulme last Tuesday.
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