User blog comment:Omega natsu2/Episode 181: Fairy Tail vs. Executioners, Review./@comment-203.87.152.6-20140510103640/@comment-49.184.77.65-20140511052336

I think what Kamika meant is that Mirajane was once a powerful S-Class Mage, everyone knows she lost her badass-ness when she thought Lisanna died. She no longer fights... so basically same as a regular mage.