Great trip report. I am a big advocate of getting kids out in the wilderness. My daughter never really liked backpacking, but my son does. Both are adults now. But both liked camping in campgrounds, which we did every summer on vacation.
Little toys help a lot at that age, along with frequent stops. I can still remember a few things from our 1st daughter/father trip over 20 years ago (she was about the same age as yours)... wish I had taken a camera like you did. :(
My daughter hated campground toilets at that age, and once down the trail it dawned on me that cat holes might be a huge problem. But when she saw we could burn toilet paper, she had to go about every 30 minutes. The other was when it was time to cook dinner she said, "Daddy you don't know how to cook, because mommy always does it. I am going to have to cook for you." So meals were a lot of fun, as I let her help.
Keep taking her out, don't push her, and TAKE LOTS OF PICTURES. Blink an eye, and they grow up and leave home (hopefully) !!
Thanks for the pictures, they brought a lot of smiles here.