Trena Kelley moved to Manteca in 1966.
In 1976, she was the first woman ever elected to the Manteca City Council. She was appointed the first woman mayor of Manteca in 1979 by her council colleagues and went on in 1980 to win the honor of being the first publicly elected mayor.
Kelley served as commissioner on the San Joaquin County Juvenile Justice and Juvenile Delinquency Commission from 1974 to 1996, for over two decades has collected holiday gifts and clothing for abandoned and parent-less infants and minors housed at Mary Graham Hall. She has served many years as an ombudsman in a state and county program looking out for the rights of the elderly in board-and-care nursing homes in the Manteca area.
Kelley was the driving force behind establishing a board that helped establish low-cost housing for qualified seniors in Manteca. It resulted in 84 units being built in Manteca.
She was a member of the first board that attempted to establish a Boys & Girls Club in Manteca and was part of a trio of volunteers who started the Manteca Community Action programs for handicapped adults. She was involved in the church-operated Meals-on-wheels program and was instrumental in setting up the city's Taxi-Fare program for qualified, low-income citizens.