During her tenure in office, Teahan was named Legislator of the Month by the Massachusetts Medical Society.

She served on the Committee to Study Adoption, the Committee to Study End-of-Life Issues, the Special Commission on Oral Health, and the Special Commission on Complementary and Alternative Medicine.

She has been a member of the Girl Scout Council of Southeastern Massachusetts Board of Directors and the Whitman-Hanson Citizen Scholarship Foundation.

She has served as the Massachusetts Team Leader for the National Foundation for Women Legislators' partnership with the United States Department of Veterans Affairs to bring national awareness of the Veterans History Project of the Library of Congress American Folklife Center.

Teahan was honored for her legislative efforts by the Congressional Coalition for Adoption Institute (2003 Congressional Angels in Adoption award), Health Care For All (2002 For the People, Against the Tide Award), and Tufts University School of Dental Medicine (2003 Professional Recognition Award).