A Missouri mom will spend 78 years in prison for waterboarding her three children, among other tortures.

St. Louis woman Lakechia Stanley, 34, was sentenced Friday over 30 charges related to child abuse, the St. Louis Post-Dispatch reported.

The crimes first came to light in October 2011 when Stanley's 10-year-old daughter told her school librarian that her arm was sore. The girl said her mother had beaten her with a baseball bat for not cleaning the kitchen quickly enough. The child also said her 8-year-old sister had been beaten with a bat for taking too long in the shower.

The child was taken to a hospital, where doctors said her arm had been beaten so badly that the blood supply was restricted, making her arm cold and hard to the touch.

Prosecutors described Stanley's actions as "systematic torture."

More from the Post-Dispatch:

Interviews with the girls revealed prolonged abuse in which they had been waterboarded, whipped with electrical cords, forced into scalding or freezing showers, and beaten with an array of blunt objects. Further investigation revealed significant scarring on all three of the women's children, prosecutors said, and even worse emotional trauma.