No, She is not the original. The monuments at the entrance of Fallen Gate prove that there have been many kings and queens before Christanos and Naythox Thex.
It's a tradition of sorts for the ruling King and Queen to take the name of Christanos and Naythox Thex after the original king and queen that Innoruuk stole from the Elves and corrupted into the first Dark Elves.
This Christanos is the same one from EQlive though. Her body is being inhabited by some extra-planar being, but it's not expanded upon. We don't know what it is, how it ended being inside her, or anything else.