Born in Tavistock, Devon and trained at Slade School and Royal College of Art. Received an Hon. mention at Paris Salon in 1928. Her subjects were frequently connected to animals and sport - horses, polo, dogs and also landscape.

When in St Ives, she worked from the Island Square Studio.

In September of 1945, Arminell exhibited with her fellow-artists in the Plymouth Society of Artists' 2nd exhibition of works by members of the Society.  Though not exhibiting a Cornish subject, this demonstrates that she was still showing her work in the West Country and showing with artists that she would have known previously in Cornwall, such as Borlase SMART. Nevertheless, her sending in address that year was 15 Brunswick Hill, Reading, Berkshire.