Why does Du Lisha always speak English, but not Chinese?

Du Lisha was born in Hongkong. It seems that many Hong Kong stars speak nonstandard Mandarin. And her nationality is Canada, and she basically communicates in English. In the program, she talked with Sandy Lam in Cantonese instead of Mandarin. I don't think she has learned much Mandarin. On the other hand, she may not speak Mandarin at all for fear that it is not standard.

Pure personal opinion, don't spray if you don't like it.