She competed at the 1908 Summer Olympics in London.
She was born in Abbeycwmhir, Powys, Great Britain and died in East London, South Africa.
Day competed at the 1908 Games in the only archery event open to women, the double National round.
[1] Day was Welsh, and her husband was a priest of the Church of England named Ernest Hermitage Day (1866 – 1946).
This biographical article relating to a British archery figure is a stub.