Someone mentioned the sprite also had JP text that loosely translates to: "Use Urara's Power!" So she might end up being the magicite dungeon RW that we can use since they're getting rid of RW for magicite dungeons. Really hope this isn't the case, or if it is, they give her to us as a usable character as well.
Edit: Yep, she's a RW for Magicite.