She was previously married to the English director Peter Kohn, the first assistant director of all three Pirates of the Caribbean movies. They were married at Wandsworth in 1984 and divorced in 1987.
After a career as a top fashion model, Amanda trained as an actress at the Academy of Live and Recorded Arts, in Wandsworth, South London.
She was named after her aunt 'Mandy' Miller (real name Carman Isabella Miller), the child star of the movie Mandy (1952) about a deaf-mute child. Mandy Miller had appeared in ten movies by the age of fourteen, but she gave up acting for good at the age of eighteen.
She was the co-host of the emergency action video In a Split Second (1998). The production shows you what to do in the event of a gunshot wound, a heart attack, electrocution, choking, and other emergencies.
Amanda has been married to the American actor Corbin Bernsen since 1988.