User blog comment:IamJakuhoRaikoben/Chapter 518: Master Enchant, Review./@comment-112.202.164.133-20170122021538/@comment-25334245-20170122045509

I also thought she was talking about Makarov. Maybe he showed her the spell he used to save the village in "Natsu Devours a Village" - he did say he would one day.