It's so cute that your oldest, after hearing talk in school, is now questioning, albeit mildly at this point. If they're anything like I was, they want to keep believing at any cost, so your deflections are likely quite acceptable. :)
Nice post on the parent's joys and issues with young kids and Christmas season!
Yes... at the moment, she still really wants to believe! So, things are still in the imaginary mode!... but I really start to think that it is the last year for her... but then she will have fun being part of the conspiracy for the little one!