In 1949 she began a climbing career in the mountainous regions of BC and Washington state that made her perhaps the most distinguished female climber of her generation in Canada.
On May 12, 1957, while on a spring ascent of Mount Slesse near Chilliwack, British Columbia with Geoffery Walker and David Cathcart she discovered the wreckage of TCA Flight 810 which had gone missing in December 1956.
Pigou and several local mountaineers, including Paddy Sherman and "Fips" Broda had surmised that Slesse was the most likely site of the crash of flight 810.
[1] On July 30, 1960, while on an attempt to ascend Mount Waddington, she and climbers Joan Stirling, John Owen and Derrick Boddy went missing.
[3] The bodies of all four climbers were left in place, and a memorial was erected nearby on the south shoulder of Mount Jeffery by the Alpine Club.