Your kids will absolutely love the dog sled ride. I think it was the highlight of the entire Alaska trip for mine!
The dogs get crazy with excitement when they are getting harnessed up for the ride and when they take off they go like mad. It's a thrilling experience that is over far too quickly!
If you and your daughter have time in Juneau after the glacier you might like to take the Mt. Roberts tram up the mountain. It's a fun experience as long as she isn't afraid of heights.