(Part 2) Top products from r/yellowstone

It seems like you have a good grasp on what to expect on your trip which is great. I would suggest going to the hotel and saving the GTNP visit on your way to the airport.

Lamar Valley is a pretty big area and it's best to visit it early in the morning or at dusk as bears and wolves are most active at that time of day. If you see a bunch of people with spotting scopes and large camera lenses standing by the side of the road they are most likely observing one of those big animals.

If you want some books to help you with your trip, Yellowstone Treasures: The Traveler's Companion to the National Park is a very detailed one. For day hikes A Ranger's Guide to Yellowstone Day Hikes book is good and Trail Guides Yellowstone web site is an excellent source for all things Yellowstone.

I honestly think you're making this harder than it needs to be. A few good books should tell you all you need to know about the region. Buy now and read for the next 9 months, and you will appreciate the place so much more. The 'roadside geology' series is generally quite good. https://www.amazon.com/Roadside-Geology-Yellowstone-Country-William/dp/0878425810/
There are dozens of hiking guides, and more than a few books dedicated to the wildlife and fauna of the region.

Depending on the length of your vacation, you might consider also camping in an adjacent national forest. I camped for 5 days in the Wind River mountains to see the eclipse and saw moose, antelope, badgers, etc., in a gorgeous setting. And even with the eclipse pending, the people density was orders of magnitude lower than any place in Yellowstone. The Beartooth mountains NE of the park are some of the prettiest in the region.

The park is BIG and driving about takes time. I always plan to be gone all day when I head out in the morning. So, bring something for lunch, bring plenty to drink. All the visitor areas have food, but, its so much better to sit by a river or valley and eat lunch vs. waiting in line at a snack bar.

I really like this book. It is small and easy to use when driving. It breaks down the loop road into sections and give you highlights of the section referenced.

I like this book also

Binoculars or a spotting scope are great for Yellowstone as there are many long distance vistas.

I can personally make no recommendations, except maybe for It Happened in Yellowstone, which is full of short anecdotes about the park, or possibly Truman Evert's famous account of his time lost in Yellowstone, Thirty-Seven Days of Peril -- also sold under the title of Lost in Yellowstone.

If those don't appeal to you, you might have a look through what the Yellowstone Association book store has to offer for kids. It seems like there are a fair few adventure stories that are specifically aimed at young girls. Here's the Glacier Conservancy store, as well. If none of those titles do the trick, then I suppose it's going to be up to the parks themselves to spark the spirit of adventure in your daughter's heart.