Later, at Citytv Toronto, she worked as a writer, reporter and co-anchor, with Gord Martineau, of evening newscast CityPluseat 6. There she hosted an afternoon program, Sweet City Woman. Petty also anchored CITY-TV's short-lived 5:30 p.m. news and current affairs program CityWide from May 1987 until 1989 when she left for CFTO-TV.
On Citytv's daily talk showCityLine, Petty established herself as one of Canada's foremost television talk show hosts. She left her news anchor position to concentrate on CityLine.
Petty has written a children's book, The Queen, the Bear, and the Bumblebee, published in 2000. Joanne Findon (professor of English literature at Trent University, Ontario) described the book as ... a charming fable about the value of being yourself and recognizing your own strengths. while Publishers Weekly was less flattering writing "Despite a bumblebee protagonist, there's little to buzz about in this didactic picture book"