If you can pass the OET test and obtain 4Bs within on exam, you can apply for the RN in OZ.
Or you have to pass the IELTS test and get 7 on all of the 4 parts of test within one exam.
After the bridging course, she has to pass English test, otherwise she still can't be registered with the nurse board.
4 7' is not a easy task. No registration, no job offer.
Think twice.