I don't know how much help I'll be - we only talked for a little bit, and we were being chased by Acnologia for most of that time. [Erza accepts the coffee cup, taking a seat in a nearby chair.]

She said that it took her five years to find the Dragon Slayers, and during that time, she found out about something called the "Time Lapse". It was a hole in time and space, and it was created as a result of the Eclipse Gate being used. Anna was under the impression that nothing could exist there, though that turned out not to be the case.

Nobody knew that you and Emperor Spriggan were one and the same until recently. I guess she thought that the Time Lapse was the best solution to the threat of Acnologia, and focused on that since she didn't know where you were.