[1] Castrilli also served on the Governing Council of the University of Toronto from 1989 to 1995 (including two years as its chair), was a trustee with the Sunnybrook Hospital from 1993 to 1995, and was a director of the Royal Ontario Museum, also from 1993 to 1995.
When Lyn McLeod resigned as Liberal leader in 1996, Castrilli initially entered the race to succeed her, ultimately giving her support to eventual winner Dalton McGuinty.
Castrilli initially planned to run as a Liberal in the 1999 provincial election, but was defeated for the party's nomination in York Centre by fellow caucus member Monte Kwinter.
[6] The Progressive Conservative government had previously reduced the number of constituencies from 130 to 103, forcing several incumbent Members of Provincial Parliament (MPPs) to compete against one another for renomination.
She was appointed by Premier Mike Harris as the director of "Partnership with Ontarians", an office created to promote the province for international business.