[1] Working as a secretary and then a business and typing teacher at Victoria Park Collegiate Institute, Trimmer became interested in politics after opposing development in her community on the Tam O'Shanter golf course lands.

A supporter of the environment, she opposed development and worked to protect the lands in what is now the Rouge Park.

In retirement Trimmer moved to Alliston, Ontario and wintered in Florida.

After leaving politics, she chaired the Mike Harris Task Force on Bringing Common Sense to Metro, a committee set up by the provincial Progressive Conservative opposition to investigate reform to the Metro Toronto level of government in the run-up to the 1995 provincial election.

She came to oppose the actions of the provincial government when it opted to amalgamate the six municipalities in Metro Toronto to a single city, and eliminate the former Metro Toronto government.