My girlfriend and I will be traveling to China and Hong Kong next month. I am an EU citizen and she is a Chinese citizen with permanent residence in the EU. For me the case is clear (I need to get a visa for Mainland China), but we are unsure about her.
Our route is going to be EU -> China -> HK -> China -> EU. We will get to HK via train and probably stay there for a few days (< 7) and then fly back to China (1.5 days) only to go back to EU. What travel document does she need to go to HK?