Maybe she's born with it... Maybe it's Elvelline.

Arcane: Light
Base Rarity: Ultra-Rare
Troop Type: Elemental, Elf
Troop Role: Support
Troop Id: K06_09 / 6315
Max skills: 18    32    6    4
Kingdom: Forest of Thorns
Kingdom Id: 3015
Trait #1: Wood Ancestry
Immune to Mana Drain, Silence, Faerie Fire, and Entangle.
Trait #2: Nature Pact
25% chance to summon a Dryad on death.
Trait #3: Nature Spirit
Gain 1 Magic for each Green ally.
Spell: Nature's Growth
Description: Give [Magic + 1] Life and 2 Magic to an Ally. If the Ally is an Elemental, give double the effect.
Mana Color: Green, Yellow
Mana Cost: 13
Spell Id: 7465