What metaphors are used in Wondrous Strange by Lesley Livingston?

Kelley wears a four-leaf clover necklace around her neck. She thinks that it's a gift from her Aunt Emma. In reality, Bob stole it from a leprechaun and gave it to Kelley to shield her glow as a Fae and protect her in the mortal world. It is a metaphor of the power of the metaphysical world.