O'Neill's painting practice is both meditative and intuitive in conception. She is a representational painter because recognizable subjects and their thematic content provide the means in which she can forge relationships between the physical world, and the less tangible forms of imagination. Her studio production consists of both oil on canvas and panel paintings.
O'Neill studied at Grant MacEwan College (Fine Art Diploma 1994), the University of Alberta (BFA 1996), and the University of Guelph (MFA 2000). She has exhibited regularly in solo and group exhibitions since 1990, and her paintings are included in public, corporate and private collections across Canada and in Europe. She has taught visual arts classes for Adult Education in Alberta and Ontario, and recently has worked as an instructor for the School of Fine Art and Music at the University of Guelph. O'Neill presently resides in Guelph.