Kate Hayllar was an eminent painter of genre scenes of the 19th century. Her work was exhibited in many galleries in London, notably at the Royal Academy and at Suffolk Street.
She concentrated particularly on the painting of flowers and still lifes and exhibited 12 paintings at the Royal Academy between 1885 and 1898, including six watercolours illustrating literary episodes. However, she became a nurse at the turn of the 20th century and decided to give up her painting career.
Kate Hayllar had three sisters, Jessica, Edith and Mary, all of whom were also successful artists specialising mainly in genre scenes.