I was about to add if it was anything like my younger sister it was probably about hamsters. She was obsessed with hamsters when she was little.
I don't think I even knew what a hamster was at that age, actually >_< I can only call it poetry because it was
a. words
b. that had a verse structure and some sort of rhyme
But it usually wasn't
about anything in particular*, just words slung together, because I mostly didn't know how to convey meaning--I just thought rhyming and alliteration were kind of cool. If you look at all of the short stories and things I have saved back then--or teacher reports, stuff like that--you can tell that a lot of it is just a failing struggle to be comprehensible, and also a general distaste for trying to communicate anything. My ability to think through a problem or an idea was far in advance of my ability to communicate the solution, so I got a well-deserved reputation for being difficult and annoying.
And I liked building stuff, though I think I sort of thought anything you put in the right pattern would work. So the idea of "the right type of wood" or "the right type of stretchy material" was not something that ever dawned on me >_>
*Eh, I wrote a song about morning glories in the morning (... yeah, seriously) and another one about rivers on fire or something like that, but that was a couple of years later.