User blog comment:Miskos3/Fairy Tail Episode 247: Tartaros arc: Alegria, Review/@comment-26287497-20150822110321/@comment-2214433-20150822121157

Her mark is on her leg even though in the old anime, it was on the same place as Natsu's mark, it isn't till Edolas that we see it on her leg.

However, this was the case in manga as well if I recall, so they're just following it.