I take a backpacking trip to the Sierras twice a year usually. Haven't taken DD yet. I took her on a backpacking trip to Catalina this past summer instead to test how she would handle it. She really impressed me, the Trans Catalina Trail (Two Harbors - Little Harbor) is no joke, especially when I made her carry her own 35lbs pack.
I have some good memories of that hike from when I was a kid.