Mighty Min by Melissa Castrillón

You're never too small to be mighty.

Young Min lives with her four aunts in a tiny house at the bottom of the garden. Min thinks she is too small to do anything heroic but one evening she is whisked away by a huge owl. He explains there is a monster in the garden and many of the smaller animals need to be rescued. 

Firstly Min finds the lost babies for a mother rabbit. Then she untangles the tail of a small mouse. All night she is kept busy. A beetle needs help to flip off his back; a grasshopper needs a bandage on his leg; and two snails need reassurance it is safe to come out of their shells.  But who is causing all of this terror? Min comes face to face with an enormous cat. She could run away but no, our little Min finds the perfect solution. She tames the cat by tickling it. Think about this. It is such a beautiful way to resolve the conflict. When she returns home she is so delighted to share her own mighty tale. You can see inside this book here. 

Here are some other books illustrated by Melissa Castrillon:

Nano

Dear Little One

If the idea of miniature worlds interests you here is a fairly new picture book you could investigate. 

I would also pair this book with a very old (long out of print) book I adore:

You might also look for the movie Arrietty from studio Ghibli which is based on the novel The Borrowers by Mary Norton.