She is a member of Senate Committee on Public Health, Welfare and Labor, Senate State Agencies and Governmental Affairs, Senate Interim Committee on Children and Youth, Joint Budget Committee and Arkansas Legislative Council and serves on several different subcommittees.

During the 2019 regular session, she co-sponsored Act 198 to expand broadband Internet access in municipalities and rural areas. She also co-sponsored laws to raise the maximum speed limit on interstates to 75 m.p.h., to strengthen investigations into maltreatment at long term care facilities and to clarify the implementation of Amendment 100, the Arkansas Casino Gaming Amendment.

She has served on the Russellville School Board, for which she was named President, Communications Liaison and Legislative Liaison. She also has served on the Arkansas Board of State Athletic Training, the Arkansas Commission on Eye and Vision Care of School-Age Children, the Russellville Downtown Master Planning Commission and Leadership Russellville. Senator Davis graduated from Russellville High School and has a bachelor's degree in speech communications from Arkansas Tech.

Senator Breanne Davis was the first member of the General Assembly to be pregnant and to give birth while in office. She gave birth to a baby girl in the fall of 2018. She and her husband, John-Paul, have two sons and two daughters.