She also attempted to murder his wife Milo Poe-Paila, stabbing her twice in the upper chest, but she survived thanks to emergency heart surgery.
Feeling jilted by Ah kee, Momoisea had earlier told some family members and a pastor of her murderous desire prior to the brutal attack but they did not believe her.
Afoa Frazer Ah kee was murdered on June 26, 2017. Photo / Supplied
For murder, Momoisea was sentenced to life imprisonment with a minimum non-parole period of 14 and a half years. She appealed against the minimum term.
During sentencing, Justice Mathew Downs said it was "plainly brutal and callous" attack.
He noted it was significant that Momoisea had been banished from her village.
"Because of what you did, your family has engaged in Ifoga, a Samoan cultural process that involves seeking forgiveness. I have been told your family were, or at least felt, humiliated and have suffered financially."
Justice Downs also took into account her prior good character saying she had been "a stranger" to courts but said it seemed she lacked remorse.
Today, in a decision delivered by Justice Ailsa Duffy, the Court of Appeal ruled it was satisfied Justice Downs paid "sufficient regard to personal mitigating factors and the guilty plea".
At the Court of Appeal hearing in September, defence lawyer Rob Stevens had argued that Justice Downs "failed to give sufficient weight to the mitigating factors in this case".
Stevens argued the specific cultural circumstances, such as the shame she felt within her community, needed to be better considered.
He also said she was struggling in prison because she can not speak English.
Junior counsel for Momoisea, Russell Nye-Wood, said her prompt guilty plea could also be reason for further discount.
Together with Stevens, he argued in favour of an overall sentence reduction of about four and a half years.
This was opposed by Crown Law.
Crown lawyer Andrea Ewing said many murders arose from a perceived slight and it was not something the law sees as excusable.
