Looking for advice: Cohabited with girlfriend (never married) in HK for 8 months while she was pregnant and shortly after giving birth.

She requested to move back to her home country and after 2.5 years we separated for good. She now wishes to return to HK (PR). Obviously I will support our child from our short relationship (c.3 years)

She also declined alimony from her ex-husband (15+ years) while we were in her home country, much to my chagrin and with her also knowing that our relationship was on the rocks. He is also HK PR.

What responsibilities legally do I have to her given she now has more assets than me but she has not yet found employment.
I'm concerned about her move to HK with the limited support I can provide beyond that of taking care of our son.

Thanks in advance.