Praeger has been a member of the Curriculum Development Center of the Commonwealth Schools Commission, the Prime Ministers Science Advisory Council, WISET Advisory Committee to the Federal Minister for Science on participation of women in Science, Engineering, and Technology, UWA Academy of Young Mathematicians Lectures, the Western Australian School Mathematics Enrichment Course Tutor, and Data Analysis Australia Pty Ltd. She has also served on the Australian Federation of University Women (Western Australian Branch) and the Nedlands Primary School Council. Between 1992 and 2019 she was a board member of the Australian Mathematics Trust. From 2001 to 2019 she chaired the Australian Mathematical Olympiad Committee.