Just like Minecraft, Kerbal can get a little overwhelming and have a steep learning curve. Thankfully it has a strong community, again, just like Minecraft.
Scott Manley makes a great series of videos that will give her great ideas, starting with this one: http://www.youtube.com/watch?v=tgPr4q5tj-Q
Here's another series that is more linear in its knowledge progression: http://www.youtube.com/playlist?list=PLO-JFyNTqjIljuPwaHkGZpMOLTtfCuIYg
Duke
UltimaDork
12/30/13 1:59 p.m.
I will also recommend Google SketchUp, which is free. The learning curve is minimal, the cost is right - free! - and there is a bunch of prebuilt components she can download to play around with.
Rufledt
SuperDork
12/30/13 3:41 p.m.
That's some pretty awesome minecrafting. Not to take this too off topic but she should check out the server uncovery.me (type that in for server address and in a browser for their website). She'll need to use their website to gain access/get building rights. It's a hassle since you need to pass a simple aptitude test which screens out idiots, the lots are protected so nobody can wreck up your stuff, and cursing isn't allowed so you won't have to worry about a minor playing. There are some amazing buildings there to give her some inspiration, too.
Edit: I tried to hotlink but I can't since the uncovery mobile site is blog-only.
Double edit- just like to mention the new subforum "simulation central" is for all games, not just racing ones. Although it is mostly racing, because racecar.