The longtime girlfriend of reputed Boston crime boss James "Whitey" Bulger pleaded not guilty Thursday to helping him elude authorities during his 16 years as a fugitive.

Catherine Greig, 60, entered her plea in a brief appearance in federal court in Boston that lasted less than five minutes. She also waived a reading of the indictment.

Greig was indicted last week on a charge of conspiracy to harbor and conceal a fugitive, a crime that carries a maximum sentence of five years. Greig has been jailed since she and Bulger were captured in June in Santa Monica, Calif. Bulger has pleaded not guilty to participating in 19 murders.

Prosecutors say Greig actively helped Bulger escape capture, but her attorney says she's a subservient woman who wasn't aware of the extent of Bulger's alleged crimes when she fled with him.

On Thursday, Greig smiled at her twin sister when she entered the courtroom. She did not speak during the hearing, except to tell the judge she understood the charges against her and was ready to enter her plea.

After the hearing, Greig's attorney Kevin Reddington was asked if Greig was cooperating with authorities against Bulger.