I'm from overseas, currently studying medicine in Australia.
Many people say that working in a medical field with Lupus isn't impossible - but there's a few issues before you get qualified that I'm currently dealing with.
Dent and Pharm are extremely intense courses. A big symptom of Lupus is fatigue and brain fog.
If she comes to Aussie, get her to register with the Student Disability Services at her Uni straight away. They can help with all sorts of little things, whether it be a parking space close to lectures, or just smoothing the way for applying for special exams, a writer for exams, changing labs due to fluroescent lighting etc.
Make sure the Uni records the lectures, and streams them on the net. That way if she has fatigue, she can watch them over and over whenever she wants when she is better. This really worked well for me.
Will she be eligible for Medicare in Australia? If not, she'll have to go privately for every GPs visit, blood tests, specialists etc.
If she does have a bad flareup and can't continue with the semester, or fails a course, will that affect her Visa? How will she and your family cope if she does take longer to finish her course?
Is there a direct flight between her uni and your home? So if things do go bad, she can easily get home or you can come see her. The idea of having stopovers or changing flights when you have fatigue is too horrible to contemplate.
Is there a large community of your people around her Uni? Even better, extended family? When you are so fatigued you can't even wash or feed yourself you need people to be there for you. Housemates in a share house shouldn't take on that burden.
As far as entry goes, Lupus can trigger a false positive for Syphilis, but she should pass all the other necessary screenings ie TB, HIV. If she can't get vaccinated against other required things, she just needs to provide good evidence of why and it won't be a problem.
My Uni has been WONDERFUL with my hideous health last year, I contacted them very early on and had lots of meetings with the head of disciplines. I gave them copies of my medical records, and pretty much whatever I needed they'd arrange. They discounted my abysmal attendance record, arranged extra tutes when I was well, deferred my exams till when I was better, and gave me lots of moral support. However they will not change the passing mark required - I still had to get the same results as everyone else.
Before you diagnose yourself with depression or low self-esteem, first make sure that you are not, in fact, just surrounded by a-holes.