Lah'Thea-Rose fell straight into the neighbour's pool.
The two-year-old's mother desperately searched for her daughter. By the time she was found, she was unconscious.
Paramedics spent an hour working to try and save the toddler.
She was taken to hospital, but four days later, her life support was turned off.
'My heart breaks for them because I just think how life can be so cruel,' the young girls grandmother, Michelle Nelson-Cox told Nine News.
She says no one realised the fence was broken, and she would like to see more frequent safety inspections by local councils.
'Four years is too far in between,' she says. 'I think there needs to be more frequent pool checks, particularly around fencing barriers.'
Nelson-Cox is also urging parents to be vigilant.
'Never, ever underestimate your child’s inquisitiveness.'
A GoFundMe page has been set up to help pay for Lah’Theah-Rose’s funeral expenses.
Our thoughts are with the Lah'Theah's family in this difficult time.
This article originally appeared on New Idea.