Amanda Hutton, 43, showed no emotion as she was convicted of manslaughter by a jury at Bradford Crown Court.
She is due to be sentenced on Friday.
Following the conviction of Amanda Hutton, questions are raised over two little boys killed by those who were supposed to care for them.
A mother who starved her son to death threatened to kill her other children, a judge who sentenced her to 15 years in prison heard.
For two years the mummified body of four-year-old Hamzah Khan lay hidden in his mother's squalid house.