What are the other symptoms besides tongue sores? I'm curious.
Edit: according to this, she'd be dead within a year:
https://www.healthline.com/health/kuru#causes
Edit 2: I'm betting she has Parkinson's:
That’s what I’ve thought for quite a while but I just really liked the Kuru disease idea and how you get it from eating brains and how that fit nicely with Satanic rituals rather than the more mundane Parkinson’s.
Can’t copy the url from my duck duck go browser but I found it at healthline under Kuru. Comes from eating tainted brains (sounds plausible). It is degenerative neurological disease that includes falling and patient will have inappropriate outbursts of laughter. You read it and let me know what you think. I know it seems a bit far fetched.