Is single entry visa to Hong KOng sufficient?

HI, i am bringing my helper to Hong Kong and Macau for holiday on 16 Dec, she is a holder of Myanmar passport, we are arriving into Hong KOng airport then transfer by ferry to Macau.

My helper has been granted single entry visa to Hong Kong, hence, I would like to know if she needs to go thru Immigration at the Hong Kong airport before transferring to Macau by ferry?

I looking forward to your reply.