It sounds like she is doing a VCE subject in year 10?
Both my DD's did this with one not doing that well. She also didn't have a clue what she wanted to do after she left school and is now at Uni 5 years after finishing VCE.
It is open week at the Uni so it might be helpful to have a look at them to see if there is something she might be interested in. This will also help her do the right subject as some courses need certain subjects to get into. Some sort of English is a must then the others are picked from the areas you think you will need to get into Uni.
It's a very daunting time both for student and parent/carer having to pick subjects to get into Uni a few years down the track.
After talking to her about what she thinks she would like to do talk to the careers person at the school as they are usually more in touch with what is needed for Uni.

These are just some of the things we did so I hope these ramblings help