In 2011, Petrie toured with comedian Josie Long. Fourth album "Mark My Words" followed, including the song "Emily Davison Blues" – a comment on media reaction to the 2011 riots. A special film directed by Chris Shepherd for the song "Rise" from the same album was screened on Channel 4 as part of the TV series "Random Acts". In 2012, Petrie took part in the "Anti-Capitalist Roadshow" alongside Roy Bailey, Robb Johnson, Leon Rosselson, Peggy Seeger and others. She has also performed gigs with other political folk artists such as Chris T-T, David Rovics and Dick Gaughan, as well as political indie/punk rock bands like Thee Faction and Colour Me Wednesday.