The lady, who was identified as Nassanga Joweria, is reported to have directed her 14 year-old granddaughter Shakira Nalujja to connect wires on an electric pole which resulted into the electrocution of the girl in the process.
Nalujja, also a student of Simba primary school in Butaka, is said to have died instantly.
Nassanga tried to hide at her nearby relative’s home but the police managed to search and arrested her.
She will be charged with murder.
Meanwhile, Nalujja’s body was taken to Gombe hospital for post mortem.