I'm not a girl and not really in to shopping.. so I won't be the best candidate to help you
However, I can introduce you to a great group of mixed Nationalities (started by a Singaporean). I'm a part of the group but have only been to one of their gathering last year. They meet about once a week for coffee or hiking or just dinner. All are working, age ranging about 25-35. Mostly expats (including Asian expats) and some local HK'ers. They are active in Facebook (called HKLEC, Hong Kong Language Exchange Club)
If you want to find friends there, it would be easy. Bunch of nice people there (and many girls who loves shopping!)
If you can't locate them in facebook, let me know. Welcome to HK!