The mystery of the missing teeth has been solved!
My nan still had some problems today, but we think it was all because of an antibiotic messing with her insulin, so hopefully that's all straightened out. It turns out a little ol' bitty that's even more forgetful than my Nan went into her room, and took her teeth thinking they were her own. Her son gave them to the nurses and told them that they didn't belong to his mother, and wondered where they had come from. Really it was pretty funny. Mom and I laughed about it for a good while. Just thought I should let those know who were especially baffled. Just goes to show, when you get old and your teeth fall out, hold on to those dentures!