I'm not claiming any moral high ground, I'm merely staying that she worked for a Chinese media organisation and that essentially makes her part of China's political apparatus. That makes her at risk of being a political prisoner.
Also as Raltoid said, she's spent 37/47 years of her life in China. Coupled with her career choice, her government is the Chinese Government, not the Australian government despite what her papers say.
Let me put it another way, where do you think her loyalties lie before her arrest? China or Australia? If you don't think that matters, I'd urge you to examine what citizenship means.