Board Thread:Lore Discussion/@comment-5632187-20130119213241/@comment-16047389-20130823021622

You assume that she has the power to leave in the first place. Or would want to. Just because the Chosen Undead can travel between the Painted World and reality, doesn't mean Priscilla can. And perhaps the guardians aren't her jailors, but are her protectors. She seems quite content with the world and its inhabitants, and even subtley hints it being more of a sanctuary.