"It was good exercise for her, the kicking movement was good on her knees," she said.
Khalia has previously been in kindergarten but caught too many bugs from the other children because of her compromised immunity.
Playing with her younger brother in the yard is the only chance she gets to run around with kids her age.
"The see-saw was a Christmas present from their dad," Ms Tohu said. "It's pretty low, to be stealing from kids."
She suspects the theft was planned. Their front yard is visible from the road and a low fence with a gate would make it easy for two people to take the see-saw.
"I feel sorry for the kids that got it. You know, they probably really deserve it but they've taken it from other kids," she said.
Ms Tohu said she had not notified police because the theft was a small thing, and was hopeful community support and communication through social media sites would alert her to any sighting of the see-saw.
It has a distinctive green steel frame with red seats.
"I hope people keep a look out for us," she said.
Following a burglary three years ago, the family had security cameras installed.
Anyone with information about the stolen see-saw can email reporters@northernadvocate.co.nz and the information will be passed to Ms Tohu.