Crighton was born in Christchurch in January 1944. She attended Christchurch East Primary School, before her family moved to
Dunedin. There she attended Pinehill School and
Otago Girls' High School, before returning to Christchurch where she went to
Christchurch Girls’ High School. After travelling overseas and a brief unsuccessful marriage, she worked and was a single parent in North Canterbury, before moving back to Christchurch where she completed her education. She earned
School Certificate and University Entrance by correspondence, before enrolling at the
University of Canterbury with a scholarship as a mature student. Her
Bachelor of Arts degree in history, art history and classics, was followed by a
Master of Arts degree, with a thesis on colonial architecture. In 1979, Crighton was appointed registrar or collections manager at the
Robert McDougall Art Gallery, where she remained until 2001. For part of that time, she served as the New Zealand representative on the committee of the American Association of Museum Registrars. She came eighth of twelve candidates in the ward that returned three board members. She later became a community board member and chair, and she was a
Christchurch city councillor from 1995 to 2007. Her doctoral thesis led to the book,
English, Colonial, Modern and Māori: The Changing Faces of the Robert McDougall Art Gallery, Christchurch, New Zealand, 1932–2002, which was published in 2014. From 2010 to 2014, Crighton was chair of the Canterbury Earthquake Heritage Buildings Fund Trust. Since 2001, she has been a director the Theatre Royal Charitable Foundation, and she has chaired the Christchurch Heritage Awards Charitable Trust since 2009. She served as a board member of the
New Zealand Historic Places Trust between 2003 and 2010, and she was president of Historic Places Aotearoa between 2010 and 2013. Crighton was an elected member of the
Canterbury District Health Board for 12 years, from 2007 to 2019. ==Honours==