The man who allegedly inflicted those wounds was junior doctor 32-year-old Venod Skantha, who has spent the past eight days before the High Court at Dunedin on trial charged with murder and four counts of threatening to kill.
The Crown case is that the defendant killed Amber-Rose to protect his faltering medical career.
Just minutes before she was killed, the girl had told him she was planning to make sexual allegations to both police and the defendant's Dunedin Hospital superiors.
Rough, who examined the scene at Clermiston Ave, said Amber-Rose died lying on her front on her bed.
Swabs taken from various areas of her body and under her fingernails failed to give any clues as to the identity of her assailant, the jury heard.
Two large blood streaks on the wall and one on the light switch were similarly of no help.
But investigators had more success at Skantha's Fairfield home.
Blood spatter found on the inside of the passenger-side window of his silver BMW matched Amber-Rose's DNA profile, Rough said.
The six tiny droplets could have been flicked or cast off a blood-stained object, she told the court.
Tests also revealed there was a transfer stain on the inside of the passenger door, which would have likely come from a bloody surface coming into contact with it.
The DNA profile could have been a combination of the defendant and Amber-Rose, the jury heard.
The Crown's key witness - the teenager who allegedly drove Skantha to and from the scene of the crime - said the defendant was in the passenger side of the car as they left the address.
He told the court earlier this week he saw the doctor place a bloodied knife in the side pocket of his door.
Rough tested that area and found no evidence of blood.
The 24cm stainless-steel kitchen knife the Crown says was the murder weapon was analysed by scientists, along with the other blades and a knife block found in Skantha's home.