User blog comment:IamJakuhoRaikoben/Chapter 458: Morning Star, Review./@comment-4449950-20151026034141/@comment-5266348-20151026042418

Erza's lost vs Jose, vs Cobra/Racer/Hoteye, and some argue vs Jellal. Her fight vs her Edoras self ended in a draw.

Personally I think that's sufficient given she's supposed to be ridiculously powerful, and the strongest member of team Natsu.