first of all, as a chemist, I tell you that CF3 is not moe. Fluoroantimonic acid is moe.
We try to keep things reasonably realistic here. Well, except for the magic, we settle for "usually internally consistent" there.
who sais it's not magic?
1. Little creatures aren't that much faster than big ones by default. Small creatures' small legs impede them. Moreover, the reason that flies and such are so good at dodging swatters has more to do with how their brains are wired than the size of any part of them.
Little creatures have a much lower inertia. Also, I also put 30 in mind for a reason. Who sais small folk are not wired that way? Don't try to take the whole thing apart by assuming she is just a human scaled down to size. When magic can let you summon personas and what not, then naturaly occuring magic can create a tiny creature with incredibly dense and fast musculature, 20 times as efficent as normal muscles, and a brain that works images at 120 fps (number made up out of thin air)
Which actually brings me to another problem: The location of this settlement of tiny people. If they are relatively isolated from big people, and in Australia, they are almost certainly in the Outback. Which is also known as "The part of Australia where we can't find any crops tough enough to grow economically.
It's remote, and concealed with glamour, so you could even walk right by it and not notice. The inhabitants usualy try their best to avoid contact, because unless you are a magical girl that knows no fear, something 20 times the size of you is usualy scary. Their economy is going through a small(heh, nudge, get it) unemployment crisis, all parties are blaming the other and the democratic process inefficent, so resolution of that problem will take a while.
while you were writing, 9 new posts ha - are you kidding me bay12?