A Hillcrest Heights woman who had pleaded guilty to automobile manslaughter and then contended that her reckless driving may have resulted from a double dose of an antidepressant drug, was sentenced in Prince George's County Circuit Court yesterday to serve 179 days in jail.

The prosecution had argued that the fatal accident last May 8 in downtown Laurel, which killed a 30-year-old Army sergeant, may have resulted because six months earlier the woman had stopped taking the medication prescribed to help control her behavior.

The defendant, Mary Pinkney, 35, was driving a 1969 Dodge Charger at speeds up to 70 and 80 mph when she ran through a red light, according to assistant state's attorney Nelson W. Rupp.

She crashed into a 1975 Ford Granada driven by Sgt. Kenneth Baldinger at the intersection of Rte. 1 and Bowie Road at 11:20 a.m., Rupp said..

Baldinger was thrown from his car and killed instantly as was his dog, which had been in the auto with him, Rupp said. Pinkney, who lives at 3416 Curtis Drive, suffered a forehead laceration, according to the prosecutor, and was treated and released at a local hospital.

Rupp said that medical records introduced in court showed that Pinkney had been diagnosed in 1975 as suffering from a mental illness and that she had failed to take medication prescribed for her in the past.