hmm... here are my some suggestions which might be helpful.

1. Find out which gate she will be landing in HK airport
2. Does she need to take boarding pass in HK ? If so, find out in which counter she should go.
3. Instruct her not to go beyond places where police are checking bags.
4. Printout 2-3 copies map of airport terminal of HK  and if you come to know the gate number by the time she leaves, make a mark of route where she should go.
5. She must know about signs of restrooms... if not, just show her while she is here so that it will be easy for her in HK.
6. My suggestion, don't wear ornaments if she is going alone.


Finally and the best idea which just struck my mind....

Call the airlines and ask to get a wheel chair for her... It is free of cost.  You don't need to pay anything...just give few tips to the wheelchair attendant (if you feel worthy). They will pick her up right infront of the gate where she lands.....This will be the BEST option for her.. wheelchair attendant will take care of everything...take her to counter, take her to correct gate....

so take wheelchair...