 Lensink was educated at Stirling East Primary School and Marryatville High School, before attending the University of South Australia, where she graduated with a Bachelor of Applied Science (Physiotherapy) in 1991.In 2003 she was awarded an MBA from the University of Adelaide.From 1991 to 1994, Lensink worked as a physiotherapist at Repatriation General Hospital, Daw Park, before moving into the political arena.