Ending her emotional eulogy, she told the packed church that speeding was not worth it.
"Through this tragedy I want to say, don't take the risk. If you want to get somewhere sooner, is it worth it? It's not."
Through tears, Stephanie's boyfriend of four years, Sam Pou, spoke of his love for her.
He also spoke of how she was always there for him through his battle with cancer.
Angels by Fly My Pretties, Thinking About You by House of Shem and The One That Got Away by Katy Perry were all played at the funeral.
At the request of her family, many of the mourners had yellow and purple flowers to place on her casket.
Stephanie's best friend Hannah Turner remembered her friend as a "bubbly, beautiful girl".
"You know you have a best friend when she's sitting beside you in a police station holding [your] hand.
"She was the softie, the pretty one, the gentle one."
Ms Turner finished by singing Count on Me by Bruno Mars.
Friends and family carried the casket from the church followed by Ms Dawson, still holding Baby Bop.
A group of men then performed a haka as her casket was taken from the church, before doves were released from outside the church.
Mr Rielly's funeral is tomorrow in Porirua.
The spot where the pair died has been described as an accident black spot - 17-year-old Kelly Thompson was also killed there on September 30 last year.
The New Zealand Transport Agency was meant to spend $5 million last year putting in wire rope meridian barriers along the stretch of road, but it has been put off until 2012-15.
