During WW2 Heath volunteered to work as an artist for Ministry of Information drawing and painting naval subjects and factory workers in Howton’s munitions and camouflage factory at St. Ives and the Spitfire fighter station at Perranporth. She married an Italian prisoner of war, Dr Marc Prati – a political correspondent for the Italian newspaper La Stampa, who had been interned in Cornwall. 

By 1943 there were 7.25 million women engaged in war-related employment, the majority in agriculture, manufacturing and civil defence. Although recording the role of women was one of the stated aims of WAAC, the scheme nevertheless favoured images of women performing conventional roles – for instance the predominance of paintings of women as nurses in spite of the fact that in 1943 munitions workers outnumbered nurses by 100 to 1. Like other female War Artists, Heath delighted in showing women at work in some of the more unusual roles they performed during the war.