Ms Haddock is alleged to have said she and Mr Jamieson would be blamed
The mother of a five-month-old girl was worried she and her partner would be blamed when she took the dying child to hospital, a court has been told.
Craig Jamieson denies murdering his daughter Abbie in February 2008 and has lodged a special defence blaming the child's mother Nichola Haddock.
Mr Jamieson's sister Joanne was giving evidence at the High Court in Glasgow.
She told the court when she arrived at the hospital, Ms Haddock said: "They are going to blame us for this."
Mr Jamieson is accused of murdering Abbie by inflicting blunt force trauma to her head and body by means unknown to the prosecutor.
His sister told how she received a text on 8 February 2008 from Ms Haddock that Abbie was being taken to hospital.
The 29-year-old then drove from her workplace in Kilmarnock to the Royal Hospital for Sick Children in Glasgow.
She said Craig and Nichola were worried that something was wrong with Abbie.
Abbie's life support machine was eventually switched off.
Craig Jamieson's defence QC Ronnie Watson asked: "How was your brother?"
She replied: "He was a mess, he was crying. He put his hands on his head and said: 'Mum, not my baby girl'."
The trial heard how Mr Jamieson has been living with his sister at her home in the city's Drumchapel.
Mr Watson asked: "Has he said anything about the day Abbie died?"
Ms Jamieson: "That it is the worst day of his life and that he will not forget it."
The witness also said that she had never seen her brother shout at or hit Abbie and that she would not have tolerated it in any case.
Mr Jamieson's mother, Jeanette, 54, later told the court that her son was "totally besotted with his wee girl".
She said she received up to three calls from her son on the day Abbie died.
The witness told how she asked her son, as Abbie fought for life at hospital, if he had dropped her and he said: "I never dropped her and, no, she never fell."
The trial, before temporary judge Alastair Stewart, continues.