No worry. The debate is probably not as heated as it may appear.
It is not my intention to revive the heated debate, but I do want to mention something that, in my humble opinion, has not been covered extensively. First of all, there's obviously no substitute for different focal lengths—Nikon would be selling 50mm lenses only otherwise—and there's no substitute for moving around by changing perspective.
The whole changing-focal-lengths thing is easy to learn with a zoom lens. Heck, if I can figure it out, anyone can.
But moving around to change perspective is a different story. Being forced to move around will open up your daughters eyes that moving will not only allow her to change perspective in a literal sense—getting closer or further—but also in an artistic way, by changing the angle you shoot the subject from. A zoom lens prevents you from “discovering” that.
Yes, I'm very much in the “shoot with a fixed focal length lens for a while” school.
I whole-heartedly agree that learning about perspective is a major part of your photographic journey. I also believe that a fixed focal length is a good way to explore that even though I don't agree that a zoom lens prevents you from anything. What I do argue is that a fixed lens probably is not the best option for a beginner. I believe that the most important thing for a beginner in any endeavour is to enjoy the process and forced restrictions take away lot of the joy of discovery. When you have been trying the waters for a while, by all means restrict yourself if that's what it takes.
When I started out in music I had piano lessons where the teacher restricted me from playing certain keys and songs. I hated it and got put off playing music for several years. Later I picked up music again and this time didn't let anyone put any restrictions on my experimentation. I then rediscovered the joy of music and got more and more curious of the possibilities. I absolutely loved trying to find out how to produce the sounds I heard on records. Often I failed, but discovered so many things along the way that I wouldn't have found out if I had been artificially restricted to certain keys. Only then, when I wanted to dig deeper, I made the concious choice of exploring certain aspects of my instrument by restricting myself. It may not be the best way for all to learn, but I think there's a danger in getting stuck to the mantra of learning by restrictions.