If you were being cynical you might say that her parents decided to move to the UK knowing that as long as her game didn't significantly decline she'd be a shoe in for LTA funding. Not that the cynical me blames them for this decision at all.
I'm putting her as Australian.
In fact if I was Australian I'd be pretty peeved that someone who learnt to hold a racket in Australia and made all their progression as an Australian decided to switch allegiance for LTA funding.