Her heartbroken parents, Crystal and Ryan, both 33, are being comforted at their southern suburbs home. They urged other parents to talk to their children about any problems.
Their brave public intervention came as friends posted scores of tributes on social media, while almost $20,000 had been donated through an online fundraiser.
The decision to speak out was in the hope of preventing another bullying-related death.
In their statement to The Advertiser, her devastated family paid tribute to a friendly, bubbly and beautiful girl.
"She had a million-dollar smile, her face lit up the room, she just had a beautiful smile - that was our Libster," Libby's uncle Clint Gow-Smith, 39, said.
"We understand schoolyard behaviour and what starts off as pointless teasing and ridicule which can soon escalate. So please, as a parent, hold your babies tight and for the teenagers, we plead for you kids to talk and walk tall."
He said it was "really important" that kids realise it is "cool to speak up" and to "branch out to someone" if they had any personal problems.
It is claimed Libby was a victim of a bullying incident at a fast food restaurant last year, which was filmed - one of several alleged incidents.
Libby was junior life saver of the year for Moana Surf Life Saving Club, where she had been a member since 2013.
Surf Life Saving SA chief executive Clare Harris paid tribute to a "much loved and respected" girl. "We are grieving the sudden and devastating loss of Libby," she said.
"Staff and volunteers ... stand with her family, friends and our members as we pull together to support each other."
Over the past week, friends and family have gathered at Moana where a shrine has been created.
The Education Department said it had "very strong" anti-bullying policies.
"It is really important that we are clear that bullying does have consequences," said child development executive director Ann-Marie Hayes.
WHERE TO GET HELP:
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call 111.
If you need to talk to someone, the following free helplines operate 24/7:
DEPRESSION HELPLINE: 0800 111 757
LIFELINE: 0800 543 354
1737 NEED TO TALK? Call or text 1737
SAMARITANS: 0800 726 666
YOUTHLINE: 0800 376 633 or text 234
There are lots of places to get support. For others, click here.
- news.com.au