She moved to Vero Beach in 1989, and began working for Barnett Bank, eventually rising up to Senior Vice-President of Residential Lending. Mayfield eventually left the bank to start the Mayfield Group, a mortgage brokerage firm that she owned and operated. During the course of the campaign, Mayfield"s husband, who was running for Indian River County Tax Collector, died of cancer.
Despite this, Mayfield ended up defeating Abarbanell by a wide margin of victory, winning 64% of the vote.
In 2010, she was challenged in the Republican primary by Art Argenio and Bradley Ward, who hammered Mayfield for being insufficiently conservative, despite the fact that she voted "consistently with the Grand Old Party majority." Mayfield ended defeating both of them handily, winning 52% of the vote to Argenio"s 34% and Ward"s 15%, and in the general election, she only faced write-in opposition, winning easily. In 2012, when state legislative districts were redrawn, Mayfield was moved into the 54th District, which included much of the territory that she had previously represented in the 80th District.
Member Indian River County Economic Development Council, Vero Beach Finance Committee, Indian River County Chamber of C. Member of Treasure Coast Builders Association, National Mortgage Brokers Association, Indian River County Board Realtors, Florida Mortgage Brokers Association, Indian River County United Way (former funds distribution chairman), Republican Women Aware, Republican Executive Committee, Junior League Indian River County (former vice president finance).
Married Stan Mayfield (deceased). Children: Evan, Samuel, Coleman.