Your fairy is called Oak Iceshimmer
She is a bone chilling bringer of justice for the vulnerable.
She lives in forests of oak and lime trees.
She is only seen when the first flowers begin to blossom.
She decorates herself with leaves and berries. She has icy blue butterfly wings.
This is true in that I will defend the vulnerable as I hate injustice. But, I draw the line at trolling round wearing leaves and berries :)