A September 2006 redistribution of boundaries saw massive changes in the shape of her electorate of Greenway. The northward shift in electorate boundaries also saw Greenway change from marginal Liberal to safe Liberal. A further electoral redistribution in 2009 made the seat of Greenway notionally Labor on an estimated margin of 5.7%. Markus contested the 2010 federal election as the Liberal candidate for the seat of Macquarie, which had absorbed a fraction of her former electorate base. Markus won the two-party-preferred vote by 2.52 points against Labor, with most support in her traditional base in the urban east of the electorate, and high Greens votes in the smaller upper Blue Mountains booths. The 2013 federal election was marked by widespread swings towards the Liberal Party in western Sydney. In this context, Markus further extended her margin, winning with a primary vote of 47.4% and a two-party-preferred vote of 54.5%. As before, the electorate demonstrated a marked polarity, with her support being in the more urban northern and eastern portions of the electorate.