Linda's right - it's $100 HKD. It's a 20 minute ride on the Airport Express train (a wonderfully efficient way into town - much faster than a taxi) and the Four Seasons is just above the final, "Hong Kong", Station.

I'm probably too late but, if you are emailing her once she gets there, tell her that there are check in counters at the Hong Kong Sta for her return flight. She can check in in the morning and then, if time permits, shop or sightsee and then hop on the train just before boarding time (no need to spend those 2 hours in the airport).

Hope she has a great time in my adopted city.

Cheers! Judy in Hong Kong