@MikeyDPirate:
Here is one thing though, with Lisanna here then that means she will be with the main five for a bit. That could mean she would display some of the magic that her brother and sister seems fame for but really not shown often. Kind of a kick in the balls for those two characters seeing that they could have showcased this magic a long time ago.
Wow…that sucks for them. haha
Elfman did show his full transformation in the Phantom Lord Arc and Mira Jane showed hers during the Laxus Arc against Fried (whom she beat within an inch of his life). Although, in a way, Lisanna was just as good as it as Mira, and was definitely better than Elfman (considering his initial transformation is what killed her), although her only transformation shown thus far was Take Over Animal Soul: Chicken, which she used to help hatch Happy.
The best theory I can think of as to why Edolas Lisanna came back with them is this: When Earthland Lisanna died, her magical energy didn't. When the Anima sucked up Magnolia Town, it turned every living person into Lachryma. Obviously, the dead aren't living, so Lisanna's magical energy couldn't be converted into Lachryma. Instead, it went into her Edolas counterpart, as she is still alive. Thus, when Mystogan flushed the Anima toilet and shot all the magic energy and people with magic energy inside them back to Earthland, Edolas Lisanna came along, having absorbed Earthland Lisanna's magic.