A psychotic Queens woman who attacked a stranger moments after fatally stabbing her own sister to death was sentenced yesterday to 23 years in prison.

While fleeing her Baisley Park Houses apartment, where she had left Sharon Lee-Hill, 58, bleeding to death, Lovette Ross-Hill, 39, stopped long enough to assault Nikita White on Merrick Boulevard.

Lee-Hill’s ear and nose were chopped off in the May 8, 2011, carnage, cops said.

Ross-Hill last month pleaded guilty in Queens Supreme Court to first-degree manslaughter and third-degree assault.