Hong Kong visa for overseas Chinese

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?
Best Answer
She needs an Entry Permit for Social Visits to Hong Kong.
http://www.immd.gov.hk/eng/services/visas/overseas-chinese-entry-arrangement.html#c
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