Thanks for the suggestion. Actually, thinking about it, it might be best if I hard wired an access point on the other floor. Her bedroom is directly below my study (we live in an upside down house with the bedrooms downstairs and living quarters upstairs), so all I would have to do is drill a hole through my study floor and run a cable down. I know I could run the cable direct to her PC but if I run it to an access point/bridge then the wireless would be available to other machines (PS3, laptop, etc).
Would this work OK, and can you get a "wired" access point or bridge ?