Yes, well while it may be true that that was the case, sometimes it is best not to let yourself be caught with the enemy behind you even if it means you may wind up fighting another battle later, and with Xexen still a pup (for now) he is not quite a real help in the way of combat.  Besides, there was no telling what she may have done to poor Xexen if he was caught alone.  She couldn't risk him being held hostage to force her to step down.