Having moved to London, she appears under the name O'Hagan in 1854 living at 193 Stanhope Street, though it is unknown when or where she married.

She was in Paris at the same time as Sarah Purser, and was a member of her social circle, however little is known about her personal life or career.

The first appearance of O'Hagan exhibiting, under Osborne, was at age nineteen with a lithograph of Mrs Hone after Mr Burton with the Royal Hibernian Academy in 1849.

Having moved to Paris in 1866, she studied with Thomas Couture, Léon Cogniet, and Joseph-Nicolas Robert-Fleury.

[3] In 1948, M. Garbaye and J. de L'Etre of Savigny-sur-Oise, France presented the National Gallery of Ireland (NGI) with two oil paintings and four charcoal drawings by O'Hagan.