User blog comment:FairyRaven/Fairy Tail Chapter 370: Demons Reincarnated, Review and Commentary/@comment-2214433-20140207114427/@comment-7418318-20140207121505

In Edolas she was pretty precise even though she used it subconsciously. When predicting what Macao and Wakabe said, she was also spot on. And when she came back from Tenrou, she said her ability was weakened.

So maybe she get's more precise, the closer the event is to the present time (i.e. predicting something days off is vague, predicting something a few minutes off is precise), she could finally be fully attuned to the present again and thus she's more precise or her ability was immature in the past and is getting closer to it's true potential.

I'm not saying I really believe it's all her prediction, but I can easily see it happening and it'd even make sense from the in-story probability point of view, though from the story point of view I wouldn't like it.