During the 2009 Australian Open wildcards round robin, Wejnert defeated Jelena Dokić in three sets.

At the Brisbane International, Wejnert lost to eventual finalist Marion Bartoli, 1–6, 2–6.

At the Australian Open, she lost in the first round to Karin Knapp in a tight match, 6–7, 4–6.

Wejnert competed in the Nottingham Trophy where she beat Mandy Minella in the first round, before losing to eventual finalist Sandra Záhlavová.

Born in Brisbane, Monika Wejnert attended Rochedale State School, before moving to Saint Stephen's College on the Gold Coast for her final years of high school.