Brittney Dwyer has been sentenced to life behind bars with a 21 year non-parole period for killing her grandfather.
The young woman who drove from Queensland to Robert Whitwell's Craigmore home in August last year had planned on taking $100,000 from her relative but ended up finding just under $1,000.
She admitted to the killing while friend Bernadette Burns waited in the car putting on makeup.
Burns has been locked up for 13.5 years.
Dwyer's mum told Seven's Sunday Night the girls had an obsession with graveyards and killing.
She'd also self-harmed at times.
Supreme Court Justice Kevin Nicholson sentenced the 20 year old to life imprisonment with a non-parole period of 20.5 years while she also received an additional six months for the home invasion. That brings the minimum total to 21 years.
Justice Nicholson described the offending as “evil” and “abhorrent”, saying it was difficult to determine Dwyer’s capacity for remorse.
Dwyer was believed to be motivated by robbery and influenced by TV show Amiercan Horror Story.