User blog comment:Miskos3/Fairy Tail 529: Teacher, Review/@comment-7418318-20170401075358/@comment-86.70.179.165-20170401162147

NoNickNeeded, if you remember neither Zeref nor Aquarius said Anna passed through the Eclipse gate, for zeref we can understand, but i think Anna presence in X792 was the thing Aquarius wanted to say to Lucy when she came back.

The fact Ana said this to Erza will be useful in the future, I think something bad will happen between Anna and Lucy and Erza will defend the later

if you read again the start of this arc, Natsu said to Lucy ti get more training, so Anna was already present in Mashima's head at that time.