User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-7418318-20140117103141/@comment-24066070-20140118015046

She's probably just lazy and doesn't like hunting down some weak old men.

I doubt Macro allows her to read thoughts. Most likely it gives her complete control over the (human) target, so she could just order Erza to spill everything she knows.