Under Connecticut law, a woman has the right to decide what name she will use after the divorce. If a woman decides to resume the name used prior to marriage, the easiest method is to ask the judge for a "change of name" as part of the divorce decree.
If a woman doesn't change her name at the time of the divorce, she may still change it later. She can either go back to court to have her name changed or do it by "common law" method, i.e., using the name she chooses consistently, and changing all official documents to that name.