Earlier on Friday, Northern Territory police confirmed they were investigating the circumstances surrounding Dolly's death.
She was 14 years old when she committed suicide, her family announced Sunday.
After the service, mourners released balloons and butterflies.
Dolly's body was cremated in a private ceremony before the service.
Mr Vale's message comes just two days after he took to social media to blast a Sudanese mother who blamed Australia's "failing" social support system on her son's involvement in gang crime.
Those in attendance said "everyone" inside was in tears.
"Screamed in sideways and there she was".
'It was just so sad.
The statement read: "The young girl many of you will recognise as the face of our past Christmas adverts".
The teenager's death has become a battle cry against the horrors of bullying and the effects it has on mental health, particularly on young people.
'Dolly, you are loved and you will never be forgotten, ' he said in a Facebook post.
The family have established a foundation, Dolly's Dream, to prevent bullying and youth suicide, with Mr Everett saying he would "fly to every school if I could".
"It's easy to hide behind a keyboard and type whatever they want".
Numerous mourners in attendance already had bumper stickers reading #doitfordolly.
Mr Everett said the family was overwhelmed and humbled by the outpouring of support.
"It is sad. There's probably thousands of kids who've already done this", he said. They plan to establish a trust to be called Dolly's Dream.
'We also wish to thank the media for their - and the public - for their incredibly positive response to our efforts to raise awareness about bullying and the impact that it has on everybody's lives.
Everett has invited the people who harassed his "Doll" to her funeral on Friday to see what they have wrought.
Amy "Dolly" Everett, who as a child had been the face of iconic outback hat company Akubra, was remembered by her family as a "kind, caring and attractive soul".
His daughter simply "saw the good in the world and the good in everybody she met", Tick said.
"We have people come in who don't even have family and if they didn't have a hair salon to go to I sometimes wonder who would they talk to".
Relatives of other suicide victims are also speaking out, raising hopes that greater awareness of the problem will save lives.
'It won't bring our Dolly back, but it may just prevent the loss of another young life.
"Speak even if your voice shakes", he said, quoting a caption of a sketch of a dancer that Dolly had recently drawn.
'This powerful message tells the dark, scary place our lovely angel had travelled to'.
A memorial service at Our Lady of Lourdes from 10am Saturday had originally been planned for family and close friends only.