During her 40-year career as a Whitehall press officer, she worked across departments including the Departments of Environment, Energy and Health, and at Number 10 as deputy press secretary to Sir Bernard Ingham.
Her last Whitehall job before retiring in 1999 was as director of information at the Department of Health.
Charles Lewington, managing director of Media Strategy - the firm Christopherson joined as an associate following her departure from government - said: 'She was a wonderful consultant, honest and trustworthy. These are elements that earned her tremendous respect among journalists.'
Mike Grannatt, director-general of the Government Information and Communication Service, said: 'She had a unique set of qualities, she was fun, she was totally professional, she was sharp and never took her eye off the ball.'