Pender should be 8th level. If his statistics havn't been updated, that may have been due to the whole change between three different players problem.
His experience score should only be a little behind the parties (I had estimates in one of the threads at some point, I'll have to look them up) but for now you can just put him 250 points behind Larian's score.
Also, Siobhan wasn't leveled, but I added my own modifications to level her to 8th during the fight when I realized she was almost dead. If we need to recruit someone else to play the character, I think I'll need to look into doing so pretty quickly. I don't think I have any 'way out' for the character at the moment unless she ends up dead.