User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 45: September 2015/@comment-25693405-20151017042430/@comment-1776824-20151017054310

Wendy entered Dragon Force freely, with no outside stimuli, of conscious will during the Avatar arc. She has for all intents and purposes, based on what we have seen Dragon Force be in this series, mastered it.