 She continued working for the party in various capacities but grew disillusioned with Diefenbaker and was fired by him when he learned of her support for party president Dalton Camp's campaign for a leadership review.She worked for the Department of Political Studies at Queen's University in Kingston, Ontario while continuing to support the anti-Diefenbaker camp and worked on Robert Stanfield's successful campaign during the 1967 Progressive Conservative leadership election and worked for him during the 1968 federal election.MacDonald was first elected to the House of Commons in the 1972 general election as the Progressive Conservative Member of Parliament for the Ontario riding of Kingston and the Islands.