HI elizabennet, welcome!
I have registered two Nooks here in Canada, but this was a month or two month ago. I registered my own while I was in the US because I wanted to download books while I was there. When I registered all three (as we all live in CA), I made sure all of our B&N accounts had US shipping and billing addresses before registering the Nooks. If you want to have your sister do it just to be safe, make sure you have your B&N account set up with US shipping and billing addresses before hand.
Because I have my addresses listed as being in the US I can buy any B&N book with my account. Whether they are free Nook books or ones that are only available in the US, I can still shop either with my Nook or online.
Good luck, and enjoy your Nook!
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