 From 1904 to 1917 she taught at Camperdown and in a succession of small Melbourne schools at South Yarra, St Kilda, Parkville and Brunswick with diminishing success.Her increasing political activity and disputes over conditions with the Education Department probably contributed to this outcome.As vice-president of the Women's Political Association in 1912 - 1914 Guerin co-authored Vida Goldstein's 1913 Senate election pamphlet, but dual membership of non-party feminist and Labor Party organizations proved untenable.