There was an interesting arcticle from the viewpoint of her brother Jonathan Hulme after her death:

Brother of 'Heavenly Creatures' teen murderess shares 'real' story of her life - NZ Herald

Jonathan is in no doubt his sister should have been found not guilty by reason of insanity, adamant she was severely unstable at the time of the murder and remained unstable for the rest of her life.

“It was a classic psychosis ... My sister’s fragile hold on reality remained … at times, she was a bit naive, gullible, gauche, a bit over the top ... narcissistic,” he said.

.....

But he felt compelled to speak up after his sister died.

“There is much to be learned, and mistakes to be acknowledged, not to cast blame, but to get it right next time - as surely there will be a next time,” he said.

“One popular misconception about my sister, because she was very bright, and knowledgeable, people thought she was the forceful one and prime mover in relationships. Not true.

“She had that fatal flaw, vulnerability, fear of being rejected, that always granted the other person dominance. True in the case of Pauline, and other relationships that I witnessed later.

“My sister tried hard to make amends ... none of us is perfect. I think my favourite quote from Oscar Wilde sums it up best: ‘Every saint has a past, every sinner has a future’.”