She uses the external world as a trigger or metaphor for these experiences and through a period of gestation and distillation, makes a series of intuitive decisions that lead the work towards completion.

from the City and Guilds of London Art School in 2004 and was presented with the Kidd Rapinet Prize for outstanding degree work.

In 2017, Horner won the NOA17 MS Amlin Prize for "Church", a painting that was inspired by a humanitarian visit to the Calais refugee "jungle" in 2014, with a "Cenacle" prayer group formed by the Chiswick Comboni nuns.

Horner trained and worked as a scenic artist for the BBC after graduating with her BA Fine Art in 1976 until 1981.

From 1985 to 2000, she worked as a freelance scenic artist and mural painter on advertising and editorial campaigns, films and BBC TV productions.