Walker's childhood was spent living between Sydney and south-western NSW as well as traveling around the world with her family. She studied at the National Art School where she completed a diploma of Fine Arts from 1991-93. In 2000 she returned to NAS and graduated with a Bachelor of Fine Arts. She has also studied in Italy and traveled extensively.
Walker’s objective has never been to depict but to evoke. Whether it be a sense of place, an atmosphere, a feeling or a memory. Her work references nature, science and the ineffable nature of that which lies beneath the surface of appearances. The techniques that she employs: of painting in layers, obscuring and revealing, addition and erasure, these all reflect the thought processes and ideas that underpin her work.