OP here again. My sister spoke to WDW ressies on the phone. They told her that the only upgrades that were available were the ones listed on the email she'd been sent, and she told them that she didn't want any of these upgrades and wanted to stay in her LM room, as booked 6 months ago. The CM confirmed her original reservation, which specifies an LM room. Now I'm keeping my fingers crossed for my sister, hoping she gets the room she wants...or if it has to be changed because of overbookings, that she gets something she will not just like but love. Again, many thanks to all the posters on this thread. And here's some pixie dust for my sister and for all of you, too!