“It became like straw and then it just kind of fell out.
“I remember one of the first days when we went to the salon and the head of hair and makeup was in there.
“They put all that foil on, and I never really dyed my hair, so I had the foil, and then they took it off and all I could hear was someone behind me go: ‘Oh my God.’”
Brianna is of course known for her dark red hair – a feature of the character comes from her Scottish heritage and her father, Jamie Fraser (Sam Heughan).
As a natural brunette, putting the red hair on Sophie was essential for the camera.