User blog comment:Woohoot/Future Lucy and future Rogue timelines/@comment-10543621-20130607083622/@comment-7418318-20130607085553

Even in her own time f-Lucy knew what Eclipse was supposed to do, since there Arcadios also tried to recruit her. She was also captured by the minister and later freed by the rescure team.

The moment were the timelines diverged is when f-Lucy (in her own time) & Co got too close to the eclipse gate and thus got re-captured. Because of this she was sittin in prison when the Dragons arrived and thus she didn't know were they came from.

After she traveld back in time f-Lucy was able to steer Natsu, Lucy & Co away from the gate, enabling them to fight off the re-capture attempt. This put the Lucy of f-Rogues timeline in a position to close the gate before any Dragons came through or prevent it's opening alltogether (there were no past Dragons in f-Rogues timeline from the way he talked).

This second timeline later got erased or morphed into the current one due to f-Rogues interventions (promting the Ecplise 2 plan -> eclipse cannon, killing f-Lucy), which delayed Lucy long enough from closeing the gate for the seven Dragons to come through.