hi, I'm a nurse and came to oz on a 190 visa, your sister would first have to get a skills assessment from anmac before lodging a visa request. Ahpra want you to have degree equivalent qualifications. Has your sister completed any post reg study. I read a post recently saying the bridging course is available in Adelaide, Maybe give ahpra an email and see if your sisters two years experience will count. Depending where she works it maybe better using a company to sponsor her, I did it all independently but there are advertisements in the back of nursing standard in the UK.