Kenya's Inspector General of Police Japhet Koome, visiting the scene, said the death toll included 50 people found in mass graves as well as eight who were found alive and emaciated but later died.
Police near the coastal town of Malindi started exhuming bodies on Friday and recovered seven bodies that day.
"Personally I have visited about 18 children's graves," Mikali told a local TV station. She did not say how she knew the graves contained the remains of children.
For 10 years, students at the Amichai Religious School and a Kenyan school have been corresponding with one another as part of a pen pal program.