Ah.

Well, with magic involved, I had an idea to make a literal 'conversation piece' - I mentioned that I bound her soul to her disembodied head, but what I didn't mention (what I thought should have been obvious) is that said spell also reanimated the head - she can see out of her eyes, and talk with her mouth, and hear with her ears. She can't move around, but she can hold a conversation as well as the next person.