User blog comment:SethHeartphilia/Whos stronger Erza or Mirajane/@comment-93.198.51.171-20130322233840/@comment-72.199.141.175-20130612010758

" She was able to overpower Freed, another S-Class mage, without taking damage. She didn't fight for years, just to mention. "

Freed wasn't S-Class

At that point Gildarts, Mystogan, Laxus, Erza and Mira were the only S Class mages in Fairy Tail.