The Queens mom who killed her ex-cop hubby after years of alleged abuse isn’t allowed to use battered woman’s syndrome as a defense — because she missed an appointment with a prosecution shrink.

Queens Supreme Court Justice Arthur Cooperman angrily denied Barbara Sheehan and her lawyer, Michael Dowd, the right to use the crucial strategy because he said the pair blew off the latest in a series of court-ordered exams by a prosecution expert on the issue.

“This is the most awful, unprecedented decision I’ve ever read,” Dowd said outside court. “We have to present a defense without any context of a battered woman’s life.”

Dowd said prosecutors now have Sheehan’s entire account of the shooting, based on the exams and battery of psychological tests that she had already taken.