My aunt is a chinese national with a singapore PR. she is thus still holding a Chinese passport.
1) If she fly from SG to HK, can she enter HK if she hold a return ticket? If ok, how many days? Would she has any issue when returning to SG?
2) If she fly from SG to guanzhou, can she enter HK if she hold a return ticket from hk to sg? If ok, how many days? Would she has any issues when returning to SG?
3) If she fly from SG to HK, can she enter HK if she hold a next leg ticket to shanghai? If ok, how many days? Would she has any issue when return to SG?

would appreciate an urgent reply on this. thanks!