I found the diary in the cemetery that details how to perform the exorcism, (with a subtle reference to the movie "The Exorcist"). It says I need mandrake root, rosary beads, holy water, and holy scriptures. I got all of those things in my inventory and went to Francesca Gulvardi to exorcise her, but it doesn't give me the option to do so. Is there a way to do it? Thank you for your time.

Ah, nevermind. It turns out I had to go to the herbalist and have her turn the mandrake root into a potion first. Now if I could only find that stupid hammer and Thintan....

Ah, that's where the hammer was. Thank you. Unfortunately Thintan, whom I met in the Wasteland earlier, was not in West Glatzburg where he should have been, so I had to use the type \addbeing_afriend Tinthan -1 -1 code. I'm not sure why he doesn't appear for some games. Thank you for the help Kovi.