Thanks for posting this...I have twin girls who just turned five. We're planning our next backpacking trip (I took them for a 1.3 mile overnighter this past May) and they're already telling me that this time they want a tent. It was a beautiful night and we slept under the stars when we went in May.
Your daughter have any concerns about not having walls around her? Of all things my girls are concerned about a fox coming into camp while they sleep. They can't tell me where that fear originated, but it's real to them. I have a Lunar Duo that they could use, but it certainly weighs a lot more than my large groundsheet and cuben tarp.
I tried to extoll the virtues of sleeping under the stars with them but without success. We're going to go in the Spring regardless - I'll suck it up and carry a tent for them if it means we get our trip out of it. I was just wondering if you, or anyone else, had any words of wisdom that can help kids make the transition to tarping (we do a fair amount of car camping in tents). I know it's hard enough to get adults to move away from the protection of a sil-nylon tent wall, much less getting kids to do it.