[CharlotteSometimes]

It depends on how much of a back story the producers build for her, I suppose. She could have lots of covers to get her out of a hole, such as saying she's not allowed to discuss the process, activities in the Australian BB house, etc. And she could say that her parents are British and emigrated when she was younger too, which would cover her if her accent slipped. And she could be conveniently called to the diary room if things ever get too sticky, too.