Patricia Webster, who a federal prosecutor said helped package heroin in plastic bags and sell it for a major Shaw area narcotics ring, pleaded guilty yesterday to a charge of conspiracy to distribute narcotics.

Webster, 31, was arrested in May in a series of raids by U.S. park and D.C. police. Assistant U.S. Attorney Barry Tapp said she worked for Moshood Alatishe, a Nigerian who police said was a major heroin supplier.

Charges against Alatishe were dropped in August after a drug testing laboratory found no evidence of narcotics in the powder seized at his house. Tapp said the lab confirmed that heroin of substantial quantity was found in Webster's house at 233 Florida Ave. NW.

He said Webster sold heroin to a police informant as part of a narcotics business operated in an alley behind the 900 block of O Street NW. Last week, Tapp said the heroin trade in the alley was managed by Levester Charles Kelly, known as "Mr. T," who has pleaded guilty to distributing heroin.

Webster, who had been in jail for two months because she failed to appear at a previous court hearing, is about five months pregnant, according to her attorney, William F. Becker. U.S. District Judge Harold H. Greene released her without bond until sentencing Jan. 23.

She faces a maximum penalty of five years in jail and a fine of $250,000.