The Spartanburg Police Department was called to a disturbance on the 100 Block of Amos Street in Upstate early Thursday evening.
Officers found a woman with two children, a girl and a boy, and the boy was crying.
Investigators said the boy's sister told them their mother was upset because the Mother's Day card her brother made wasn't for her.
In addition to the alleged beating, the report revealed the 30-year-old tore up the card in question.
The boy's grandmother said she saw Murphy hit the boy three times in the head. An officer says he found hand-written card torn into pieces.
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The child's grandmother told police that her daughter hit the boy multiple times on the front, side and back of the head, according to Fox 5.
Murphy told deputies that she had disciplined her son because of behavioral problems at school, but that she did not hit him "hard or in a violent manner". She said the card was for their grandmother, according to the station. He was treated and released from a local hospital.
The children told authorities that their mother hits them all the time and that they're afraid of her.
Today, she's facing a child cruelty charge in Spartanburg, South Carolina.
WYFF noted that police found the shredded card in the SC home and when asked why she hit the boy Murphy said, "because she could".