i have unlocked marge AND wizard marge however i have a quest thats called upgrade wizard marge. BUT wizard marge is not in my castle. HOW DO YOU UPGRADE IT!!!!!!11
To upgrade her, you need enough gold to do so. It will remain shaded out until you have enough gold. Then you can upgrade her. She doesn't need to be in the castle for it to work.
Have you lost Marge? That's a completely different matter. Let me know if that is the case.