Winnie Kwamboka was on Monday arraigned in a Kisii court and charged with torturing and sexually assaulting her nine-year old stepdaughter.
Appearing before Senior Resident Magistrate Ezekiel Obina, she failed to take plea.
The court ordered her to undergo mental check-up.
According to police reports, the woman tortured the minor using a red hot knife which she also inserted in her privates at their rented house within Masongo village, Kisii County.
The minor is currently at Kisii County Referral Hospital where she is undergoing treatment and is in a stable condition.
The suspect will be arraigned on Thursday for plea taking.