Melissa Oates was sentenced in Hobart Supreme Court on Thursday after pleading guilty to the charge of dangerous driving last month.

The court heard Ms Oates was three times over the legal limit and driving at an excessive speed of 100 km/h in a 50km/h zone when she hit her partner Jari Wise, 26, on Wilmot Road in Huonville on February 29, 2020.

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The pair had been drinking at a gathering during the night and Mr Wise had left to visit a friend.

Ms Oates had left the house later on to get food from a service station at about 1am and had a phone exchange with Mr Wise who asked to be picked up while she was driving.

She later struck Mr Wise while travelling along Wilmot Road while he was in her lane.

In sentencing, Justice Gregory Geason said a witness to the incident reported the sound of the collision was like two cars colliding.

He said a medical examination had found Mr Wise would have died almost instantly.

The court heard Ms Oates fled the scene and travelled back to the place where she had been drinking and told a neighbour Mr Wise had jumped in front of her car.

It heard Mr Wise had been wearing dark clothing at the time and the street lacked lighting.

Justice Geason said there had been no forensic evidence obtained to dispute Ms Oates' version of events.

He said Mr Wise had previously stepped in front of cars she had been travelling in which meant he had a previous tendency to act this way.

Justice Geason said the pair had been longtime friends and fell into a romantic relationship which at times could become strained.

He said they had a child together which had been born in 2019.

In handing down his sentence, Justice Geason said he took into account Ms Oates' guilty plea for dangerous driving and her acknowledgement of regret and the irreparable damage she had caused Mr Wise's family.

He said she and her children had endured threats of violence against them by his family.

Justice Geason said he accepted the prosecution's argument that Ms Oates' driving was not the cause of Mr Wise's death, but said her driving could have reasonably caused harm that night.

He handed down a 14-month sentence with six months of that suspended, backdated from her incarceration last month.

Justice Geason said the sentence was not a reflection on the value of Mr Wise's life.

Outside court, Mr Wise's mother Faith Tkalac described the sentence as "a kick in the face".

"I feel sad for her children because they won't have their mum around, but at the same time, they're never going to have dad," she said.

"And we're never going to have Jari."

Ms Tkalac said she hoped the sentence would be appealed. "This is not justice," she said.