Later in her life, she moved to England, where she became an acquaintance of Daniel Maclise, John Ruskin, and Charles Dickens.
She was commissioned by many aristocratic families in Northern Ireland, such as Lord Bangor, the Earl of Belfast, and the Dufferins.
Her miniatures of the dowager duchess of Manchester were engraved to be included in the Court Album, and 2 of her works were gifted to Queen Victoria when her visited Dublin in 1853.
Lamont also produced a series of prints of crayon drawers in 1845, illustrating Moore's Irish melodies.
A miniature of Miss O'Hara of Ballymena in the Ulster Museum is the only known work of Lamont in a public collection.