A woman who acted as the getaway driver for a series of robberies in Maine has been sentenced to more than four years in prison. Maria Mattson of Westbrook was also sentenced Monday in federal court to three years of probation. The 31-year-old Mattson pleaded guilty in August to charges of aiding and abetting bank robbery, conspiracy to commit bank robbery and aiding and abetting interference with commerce by robbery. Prosecutors say Mattson acted as the getaway driver for robberies of a convenience store and two credit unions in Portland, a credit union in Windham and a bank in Lewiston last January and February. Mattson’s co-defendant, 30-year-old Paul Sans of Westbrook, pleaded guilty in October to several counts of bank robbery and is scheduled to be sentenced in January.