What is the safest way for a solo lady traveller to get from Hong Kong Airport to Shenzen

My flight arrives in to Hong Kong at 1am, I am looking to get my self to Shenzen safely, and quickly and securly for a shopping trip for a couple of days then organise to travel back to Hong Kong to relax at a hotel and fly back home. Can you please tell me what current options there are for my travelling alone?
thanks alot.