Hello my name is Christine need regarding visitors visa to Melbourne, Australia

Hi I am currently residing in Melbourne Australia with my family and would like to invite my niece for a holiday to Australia for about 3- 4 weeks. She is currently studying for her medical degree in China, holding a SL passport.

Pls let me know if she could apply through the Embassy in Beijing and if so, what is the process involved, and who she could contact to get these details.
Your help on this matter will be much appreciated. Thank You. Christine