She's pretty big in Europe particularly the UK, and other parts of the world, not sure about the US though. She's been releasing hits since the 80's and of course there was the show Neighbours where she first came to attention.
Horrible news to hear she has Cancer, it was diagnosed in the early stages so hopefully she will recover. Pretty young to get Breast cancer at 36, usually its the mid fourties and upwards who have a significant risk of getting it.