[1] Irvin-Ross defeated Progressive Conservative incumbent Member of the Legislative Assembly Joy Smith by 87 votes in the riding of Fort Garry in the 2003 general election.
[2] She defeated Progressive Conservative challenger Shaun McCaffrey in Fort Garry by 4,291 to 2,101 in the 2007 general election.
In the 2011 general election, Irvin-Ross chose to run in the newly created constituency of Fort Richmond, which comprised most of the southern part of her previous riding, and was re-elected over McCaffrey by 4,026 votes to 2,908.
[4] Irvin-Ross was defeated in the 2016 election, losing her seat to PC candidate Sarah Guillemard.
In 2009, shortly after he was sworn in as premier, Selinger named her to the new portfolio of Minister of Housing and Community Development.