Generally speaking, the less emotional you make it, the better. As exciting as it is for you to meet the new member of your family, the pup will be somewhat shaken and will recover fastest if you're warm but matter of fact. Certainly bundle her up and hold her in your lap for the ride home, but avoid passing her around from person to person. Speak lovingly but not comfortingly to her -- you don't want to encourage the nervousness. If you need to chatter, just speak enthusiastically about the wonderful new home she's going to and all the fun she's going to have (a soothing "and when we get home you'll see your nice yard and the beautiful crate with the big soft fluffy bed inside, and you can sleep as much as you want!" as opposed to "oh, you poor baby, what happened to you? Don't be scared, Mama's here" etc. etc.) Even if you don't mean to, with the latter conversation you'll be sending a signal with your tone that will reinforce the dog's uneasy mental state.
And remember -- puppies that age sleep a lot. For about every hour up they'll sleep an hour or more. She may not have slept on the plane so that will make it doubly difficult to settle and focus until she's caught up. Just let her explore a small part of your home that first night -- maybe the kitchen/livingroom and the bedroom where she'll sleep. It's a big world and she has plenty of time to explore it and meet everybody who will be in her life. Try to keep the # of people she meets the first 24 hours at a minimum so that she can sleep and wrap her brain around her new universe.
Chances are, after a couple of naps she will act like she owns the place
