London-born Algar attended Wimbledon School of Art and the Royal Academy Schools before coming to St Ives in 1976 to live and paint. From 1994 to 1996 she had a spell working in the United States, exhibiting in San Diego, California and Dallas, Texas. On returning to Cornwall she settled in Marazion, where she now lives. Her work has been exhibited at the Rainyday Gallery, Penzance. Her interior scenes are noted for their muted hues and restrained subject matter.
Her Memorial service was held in Marazion in May 2013, and donations to celebrate her life were given to W.S.P.A. (Big Bear Rescue).