Horner was born at Green Hayes in Halifax, West Yorkshire, where she spent most of her life.
[1] In 1920 she enrolled at the Leeds School of Art to train as a sculptor and was a student alongside both Barbara Hepworth and Henry Moore.
[2] During World War II she worked as a home teacher for blind people in Halifax and also served as a Red Cross nurse.
[1] When the War ended she returned to Leeds as a student and in the early 1950s took a number of part-time teaching posts.
[2] In the 1960s Horner's work, which was greatly influenced by that of Jacob Epstein was exhibited both locally in Yorkshire and at national venues.