2)Apparently she discovered she's 'born gay' in her late teens.

3)Where did she live b4 becoming homeless ? Who kicked her out?

4)'when he was never in her life' ?Jackie chan has no parental relationship with her.. what does it means? He denied he has such a daughter?

...................

Chinese fathers wouldn't completely ignored their kids even if they are illegit, especially before the kids found out they were 'born gay'

............

A number of possibilities:

--She  needs money and found out her mother once had a celeb lover.

--She was kicked out of home by someone because of frequent teen deliquency like having wild sex parties at home. IMO, the most likely reason for her present situation

''''''''

How about compare herself to the gay son, Ronan Farrow,of Mia  Farrow and Woody Allen. Ronan is a very outstanding young man also with parentage complication. He also estranged from his alleged father Woody Allen because of the latter's incest.

http://books.wwnorton.com/books/War-on-Peace/

https://www.hollywoodreporter.com/news/mia-farrow-says-woody-allens-641534