Irene possessed a level of enchantment mastery that Wendy could never have reached without Master Enchantment and a massive amount of magical power; however, with the new chapter, Wendy received the power of the Dragon God Aldoron.
Aldoron's magic is among the most complex of the Dragon Gods', second only to Viernes's Alchemy. Aldoron possesses many "hax" spells, capable of achieving a wide variety of effects.
If Wendy gains access to Aldoron's spells, she can combine nature magic with her enchantment magic to create unique spells—something Irene couldn't have pulled off, even with Master Enchantment.
Honestly, I was really happy with this chapter, even though I had expected Wendy's second element to be Irene's element of wisdom, which would have granted her access to Master Enchantment.
But Hiro opted for an even better alternative—something I hadn't imagined. Fortunately, he managed to distinguish Wendy from Irene while giving her an incredibly versatile type of magic.
It was an excellent direction for the character.