If you are mediocre, you will have a hard time competing for a job anywhere.
If you are able to be some of the top ones, you will have no problem finding a decent job, as there are definitely much more opportunities.
Good.
Ask her to work real hard. Get really good GPA.
Then she can go to the US for master's.
Cell and molecular biology?
She will have lots of opportunity.
CUHK students have no problem with fitting in the US university system.
Good luck and add oil.