Ki'ari Pope, aged eight, complained to her mother's boyfriend of breathing problems but within minutes she was unresponsive.
She had burnt her mouth badly back in March after drinking the hot water through a straw.
At the time, the sport-loving youngster, from Boynton Beach, Florida, was taken to hospital where she received a tracheotomy, an incision into her windpipe that had left deaf with chronic respiratory problems.
Records from the Florida Department of Children and Families (DCF) say Ki'ari was 'medically compromised'.
Ki'ari's mother has now set up a Go Fund Me page to help pay for her daughter's funeral arrangements .
On the page, Ki'ari's mum confirms that the eight-year-old was involved in a dare with a cousin of the same age as her.
She wrote that after the treatment for the burns, Ki'ari struggled to talk and was deaf.
In the heartbreaking post, Ki'ari's mother, Marquisia Bonner paid tribute to her little girl, writing: "My eight-year-old daughter Ki'ari Pop gained her angel wings.
"Ki'ari was a beautiful girl inside and out. She loved sports, especially basketball."
Authorities are now investigating the incident, as well as nine other cases of abuse and neglect involving the same girl.
Some of the incidents were reported to have occurred in the last seven months.
DCF secretary Mike Carroll told the Palm Beach Post : "The loss of this child is truly devastating and our condolences to go out to all those who loved her.
"We have opened a child death investigation to examine the circumstances surrounding her death and will deploy a Critical Incident Rapid Response Team to review all interactions this family has had with Florida's child welfare system.
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