If you can get your hands on the uni guide (it's called the VTAC guide in VIC) which usually comes out at this time of year it will tell you the pre requesits for all the nursing courses available in your state and also the required TER. She should be able to pick one up at school and some Newsagents have them too.

Usually though the subjects she'll need are Maths, English and Science but it does depend on the Uni.