I agree - bring her!
While it is true that in recent years there have been fewer kids, I also think that the demographics of Airstreamers are changing -there will be more kids.
Sometimes all it takes is for one person to step up and say - I'm bringing a kid... others may read that and think "... hmm.. ok, maybe I should as well"
When my kid was in grade school every summer his grandfather made a point of taking him on some adventure through the elderhostel (now Roadscholar) program
They did all sorts of things... story telling festivals, ropes courses, Kayaking tours, a route 66 road trip, grand canyon rafting, etc. These trips shaped his world view and installed a permanent sense of adventure. Today as an adult, he travels the world, keeps his eyes on the horizon and continues that exploration.