The Westmead hospital has a service for mothers aged 12-20 so if you're near there she would be able to access that. Thier phone number is 9845 5555 and she can ask to be put through to the ante natal clinic.

Also the RPA has a young mothers program as do most of the Women's hospitals. You could also try contacting the Family Planning Clinic for advice and resources.

AFAIK young mums need to be extra sure to eat enough of the right (nutritious) foods whan they are pregnant because thier bodies are still growing as well as growing a baby.
I geuss that like any other pregnant woman she will need your support especially after the baby arrives because being a single mum is a tough job no matter how old you are.

There are a couple of women on bellybelly who have had children as teenagers - hopefully they will see this and be able to offer you thier perspective and advice.