The daughter of Harry Hynes and Eileen Power,[1] both Irish Catholics, she was born in Indore, India and came to London with her family when she was three.
Hynes studied with Frank Brangwyn at the London School of Art in Earl's Court.
From 1906 to 1907, her family was living in Penzance, Cornwall and she studied with Stanhope and Elizabeth Forbes at their school in Newlyn.
Her work was included in a group exhibition at Hartnoll & Eyre in 1972;[2] a painting from that show is held by the Royal Air Force Museum London.
[3] Hynes was a strong supporter of Irish independence and also campaigned for women's rights.