Mother's heartbreaking post after schoolgirl's alleged cyber-bullying suicide

A grieving mother has penned an emotional Facebook post after her teenage daughter tragically took her own life.

Adelaide junior lifesaver Libby Bell, 13, was found dead last Monday, with her family believing she was bullied both online and physically.

Her mother, Crystal Bell, on Tuesday wrote a heartfelt tribute to her daughter on Facebook, saying she is "too perfect for heaven".

Libby is believed to have been bullied before taking her own life. Source: Facebook

"I am lost and empty," she wrote.

"You have been an absolutely joy and pleasure to raise these short, almost 14 years, of your beautiful life.

"I will forever have a hole in my heart, where you belong because you were just too perfect for heaven."

Crystal Bell, pictured with Libby, says she feels

Ms Bell then said she wanted those who allegedly targeted her daughter to be held accountable.

"Those that bully, [your] so called friends that didn't speak up... they failed you gorgeous girl and we won't stop fighting for you until they are held accountable," she said.

"Talk soon beautiful girl... Love you more bla bla bla BOO!!"

Earlier on Tuesday Libby's uncle Clint Gow-Smith said teens need to know "It's cool to speak up" and to reach out to someone.

“She had a million-dollar smile, her face lit up the room, she just had a beautiful smile — that was our Libster,” Mr Gow-Smith, 39, told Adelaide Now.

Libby was junior lifesaver of the year for Moana Surf Life Saving Club, where she had been a member since 2013.

A GoFundMe page has been set up to help the family deal with the costs of the funeral, with almost $20,000 raised so far.

The Moana Surf Lifesaving Club paid tribute to Libby. Source: Facebook

Friends of the teen also paid tribute to her online and many people who didn't know Libby personally have also donated to the fund.

The SA Education Department said it had “very strong” anti-bullying policies.

“It is really important that we are clear that bullying does have consequences,” child development executive director Ann-Marie Hayes said.

Staff at Moana Surf Life Saving said they're grieving the "sudden and devastating loss of Libby".

If you are concerned about the mental health of yourself or a loved one, seek support and information by calling Lifeline 13 11 14, the Suicide Call Back Service 1300 659 467, or Beyond Blue 1300 22 46 36.