User blog comment:BlackWizardZeref/Fairy Tail Zero Chapter 10: Law Review/@comment-26239138-20150417102734/@comment-25334245-20150418032129

Also, wasn't she known as a great tactition, and the anime made it seem to me, like she did through at least one war or conflict.... we did not see much of that yet, so she may just have exhausted all her magic.