Gretta's work is exhibited principally at the Waldock Gallery in Dublin.

Her paintings represent the abstract forms of nature: the wind in the sails; the colour in the trees; the water over the cliff. Many an hour is spent overcolouring to acheive a blend of contrast.

She has exhibited in numerous one woman and group shows in Ireland, and has shown regularly in the Royal Hibernian Academy of Arts in Dublin. Her work is represented in many public and corporate collections in Ireland and overseas.