"I remember having shock and disbelief,'' she told the court.
"It didn't enter my head he'd been killed.''
She drove from her farm cottage on the farm's property to arrive at a police cordon where she stood with her mother and the man who discovered Scott Guy's body.
"I was really focused on just comforting my mum.''
Macdonald was nearby, and came over to talk with Ms Guy.
Macdonald and Mr Berry then had a discussion about the way Scott Guy was killed, which Macdonald insisted was by a gun shot, she said.
"I remember thinking 'how did Ewen know?'''
Ms Guy then went to her sister, and wife of Macdonald, Anna Macdonald's, house.
She said Mrs Macdonald had no idea what had happened when Nikki Guy told her Scott Guy had been killed.
NEIGHBOUR: 'I HEARD THREE LOUD BANGS'
A neighbour was disturbed by noise at about 5am on the morning Feilding farmer Scott Guy was found dead, the High Court in Wellington has heard.
Fraser Langbein this morning gave evidence in the trial of Ewen Macdonald, 32, who has denied shooting Scott Guy in his driveway as he was setting out to milk cows early on the morning of July 8, 2010.
Mr Langbein was woken by "some sort of noise or disturbance on the property'' at about 5am.
His wife also woke up and asked what had happened, but they did not hear anything more and went back to sleep.
The next he heard was a quad bike at about 7am, he said.
When he went outside to find out what was happened he was told by his landlord and the second person on the scene, Bruce Johnstone, that Scott Guy had died and his throat had been cut.
Mr Langbein could not say what it was that had woken him, but it was enough to make him sit upright in his bed.
Another neighbour, Derek Sharp, told the court today of how he heard two loud "booms'' at about 5am that morning.
"It was a boom, boom, fairly quick succession,'' he told the court.
"I concluded it was a shot gun.''
He did not hear anything else, assumed it was someone shooting a possum and went back to sleep after looking at his alarm clock and noticing it was just before 5am.
He discussed the shots later in the morning with his flatmate, Bonnie Fredriksson.
She said she had heard three shots, so Mr Sharp concluded the first shot was what woke him.
The court also heard how Mr Sharp had later spoken to a police officer at the scene cordon and expressed concern that he might have been the intended target of the shots which killed Scott Guy.
He asked whether it could be a case of mistaken identity because of events in his past.
Ms Fredriksson told the court this morning she was lying in bed waiting for her alarm to go off when she heard the shots.
She said she had had a sleepless night on July 7, 2010, and at about 5am on July 8 she heard three consecutive "loud bangs''.
"I said to myself was there anything to worry about ... I was listening, trying to hear if there was any more, which there wasn't.''
Ms Fredriksson told the court she had been around guns in her farming life, and believed the shots came from a "heavier type gun''.
FATHER-IN-LAW: 'FACE' MENTION IN PHONE CALL BOTHERED ME
Earlier the court heard Bryan Guy tell of the shock he experienced when Macdonald - his son-in-law - was arrested for murder.
It was Bryan Guy's second day giving evidence at the High Court.
Mr Guy has this morning told the jury, under cross examination by defence lawyer Greg King, of the first phone call he received on the morning of Scott Guy's death, in which Ewen Macdonald phoned him to say something had happened and had mentioned "his face''.
But Mr Guy did not tell police about the mention of his face until the arrest of Macdonald for Scott Guy's murder.
Mr Guy said he had assumed something had happened to Scott Guy on the farm with machinery because of the mention of his face.
He told the court he rushed to the farm, and arrived at the scene to be told by Macdonald that "someone killed Scott''.
After Macdonald was arrested, Mr Guy mentioned to police the initial phone call he received on the morning of Scott Guy's murder.
He said he could remember being told by an almost incoherent Macdonald that something had happened to Scott Guy, he had to go out to the farm, and the words "his face''.
"After I knew Scotty had been murdered it was those two words that I wondered 'what did you mean by that?','' he said.
"Those words bothered me because I hadn't seen Scott close up ... and I wondered whether Ewen had seen him close up to make those comments, and when it was he had seen him.''
It did not seem to be hugely significant to him until the arrest of Macdonald, which came as a huge shock, he said.
Led by Crown prosecutor Ben Vanderkolk, the prosecution will call more than 100 witnesses.
Defence lawyer Greg King says someone other than Macdonald killed Scott Guy.
His client was arrested nine months after the killing, on April 7, 2011, and has been in custody since.
A jury of seven men and five women was reduced to 11 members on the second day of the trial when a female juror became unavailable and was discharged.
