She relocated to Seattle to appear as Celia in As You Like It, Gwendolyn in Travesties, and Eylie in Ladyhouse Blues at ACT/Seattle, then returned to New York to play the double roles of Belle and Mrs. Cratchit in A Christmas Carol at Playwrights Horizon. When A Christmas Carol closed, O'Heaney moved to Los Angeles, and five weeks later she was cast as Anna Marie Hollyhock in the 1978 ABC comedy series Apple Pie, which was produced by Norman Lear, directed by Peter Bonerz, and starred Rue McClanahan, Dabney Coleman, Jack Gilford, Derrel Maury, Mike Binder and Richard Libertini. This was a highlight of O'Heaney's career. She says with regard to the experience, "It was pure magic and incredible fun working every day with these wonderful people!"