Originally Posted by
Pendulous
Last episode of the Edolas arc, where she shows up in Earth Land, after everyone gets back. Every episode with mentions or flashbacks of her always did it to me, and I had already knew from spoilers from a friend that she was still alive and would be reunited with the Earth land people.
Also, there are some anime that you watch and you think "man, they must be making this shit up as they go along", but Fairy Tail seems to have everything planned from the beginning. That, or the manga went about a thousand issues before they started the anime and then just crammed all the foreshadowing in there.