A woman was stabbed in the back by her daughter in Brooklyn, police sources said Friday.

The 64-year-old victim was watching TV at around 12:20 p.m. when her 41-year-old daughter attacked her with an unknown object at her home in Sheepshead Bay on Thursday, cops said.

It was unclear what led the daughter to stab her mother. The younger woman fled the apartment and had yet to be apprehended Friday evening.

The victim was taken to Maimonides Hospital to be treated for her injuries.