Dawna's accent

I was watching The Life Laundry and was listening to Dawna Walter's accent. It sounded like she was American, but part of her sentences, especially the end of them, sounded British.

So I tried to figure it out: perhaps she was raised in the US, particularly New York because her accent sounds New York-y, but her parents were British. Or maybe she was a Brit who spent a lot of time living in the US. Or she could be an American living in England, and has picked up a bit of that accent. Well, the answer is the last one: she's lived in England for more than a decade.