A woman accused of being drunk when she rear-ended an SUV driven by the commander of the Massachusetts State Police has been ordered held on $25,000 bail.

Donna Sclamo of Worcester pleaded not guilty to charges including operating under the influence, fifth offense, and driving with a suspended license at her arraignment Tuesday in Westborough District Court.

State police say Col. Marian McGovern was at a red light in Shrewsbury on Monday when her unmarked SUV was struck by the 51-year-old Sclamo's vehicle. Neither woman was hurt.

McGovern called for backup when she noticed that Sclamo appeared to be drunk.

Prosecutors say Sclamo has twice been sentenced to jail for drunken driving convictions, the last time in 1998.

Sclamo apologized outside court. Her attorney did not immediately return a message for comment.