[7] At age 15, she left Croatia and joined her older sister in Canada, who was married and lived in Toronto, Ontario.

[7] Tomašić worked on a variety of jobs to support herself before enrolling in 13-week program at Ontario Police College, from which she graduated in 1981.

[7] In her career as a police officer, she primarily dealt with juvenile delinquency and illegal drug trade, which included undercover work.

[7][9] In September 1990, Tomašić moved to Croatia, by invitation from then-President Franjo Tuđman who met her during his state visit to Canada, and served as a bodyguard for top Croatian government officials.

In the meantime, Tomašić appeared in approximately 20 episodes of The X-Files and Millennium as a stuntwoman, drawing on her experience of riding a police motorcycle in the mid-1980s.

[18] In December 2010 Tomašić received the Order of Stjepan Radić in recognition of her efforts fighting organized crime.

She was re-elected MEP following European election of 25 May 2014, serving her second term in office, placing 5th in the candidates list of HDZ.

Commenting on the statement by Serbian Labour Minister Aleksandar Vulin, who said Croatia cannot give lessons to Serbia about war crimes after Croatia's Interior Minister Ranko Ostojić said that Serbia could improve its path to join the European Union by holding a trial for the murder of twelve Croatian police officers in Borovo Selo during the Croatian War of Independence, Tomašić stated: "Let them [Serbs] pray to God that we do not clean up our yard because if we start to clean our yard you will have a lot more Serbs from Croatia who will have to go to Serbia.

Her statement was criticised by many, including the Committee on Human Rights and National Minorities of the Croatian Parliament.