I've listened to my 94 yr old mother's crazy talk for long enough. Today, I snapped and told her she is imaging these things -- she is hallucinating -- they are not happening in real life. She is now accusing my brother-in-law of breaking into her apartment every night (she SEES him) and stealing anything from her dishwashing detergent to her reading glasses. And he's stealing her mail. And groceries. Now I've tipped her off that we all think she's demented (without using the word, I think I might have said "crazy", yikes). How will we ever get her to realize that Doug (son in law) is not committing these crimes, and that she in fact is in need of help? We've got to get her out of I.L. and into some sort of assisted situation. I'm just shaking, and I realize I just lit the fuse to a huge explosion.
However, the others are right and I think you’ve gotten the advice before that Mom really does need to be evaluated. It should have happened already. Call her doctor tomorrow and get her scheduled for a geriatric psychiatric evaluation. Then you can decide where she should go.