"She was courageous about everything", she said.
Kidder later started advocating for mental health awareness. "There was nothing to be ashamed of".
Kidder was a prolific actor with credits in shows like "Boston Common" and "Smallville" over the years, and she was working up until last year, according to IMDB.
"We got brought up feeling that we that we had a responsibility to have a voice - a loud voice - for justice, for fairness", Annie Kidder told CTV News Channel. "She is a dear friend who has always been there for me, and I would do anything to help her".
She then appeared playing Siamese twins in Brian De Palma's cult thriller Sisters (1973); in the slasher film Black Christmas (1974); and the drama The Great Waldo Pepper (1975), opposite Robert Redford. She was an outspoken political, environmental, and anti-war activist, speaking out and protesting on behalf of the state of Montana against irresponsible drilling and pipeline leaks.
Born Margaret Ruth Kidder on Oct 17, 1948 in Canada's Northwest Territories, she grew up in a small town without a movie theater.
In her personal life, Kidder endured mental health issues, including a manic depression diagnoses and injuries from an on-set vehicle accident that left her using a wheelchair for two years. "I'm saying this is the pattern of my life".
The film shot her to global fame - something she later called "the weirdest thing in the world".
The silver screen's Lois Lane has sadly passed away.
"She became politically active and I thought she was very interesting in her feistiness and rebellious nature in life".