The grandmother said she was in church when Tiyiselani went missing on Sunday.
"I left her with her other siblings at home in the morning. Later in the day, I received a call that Tiyiselani was missing. I quickly called a few neighbours and we combed the local bushes and could not find her.
"In the afternoon, I went to the police to report a missing person. I even told them that we suspect her body was in the dam and they told me they would wait for a search and rescue team and sniffer dogs."
Police spokesperson Brig Motlafela Mojapelo said a manhunt for the killer(s) had been launched.
"The discovery was made by community members who then called the police.
"On arrival at the scene, the police retrieved the body and discovered that some of her body parts were missing," Mojapelo said.
Mojapelo said the motive for the murder was unknown at this stage but said that murder for body parts could not be ruled out.
Tiyiselani's father Thulani Rikhotso said he was shocked and in disbelief about his daughter's murder.
"I arrived on Wednesday from Gauteng to see for myself. My brother, I'm heartbroken. I want police to find her killers soon," he said.
MEC for social development Nkakareng Rakgoale has also reacted with shock to the incident.
"Incidents such as this one are again putting in the spotlight the general safety of our children in communities.
"I cannot begin to imagine how a person can decide to take away an innocent soul just like that.
"We are once again appealing to parents and communities to always keep a close eye on children who are in their vicinity," Rakgoale said.