Any of my ho's dealing with aging parents...

Best wishes to all. I hope that you relish the good times and have the strength to get through the bad.

I was going to post a new topic with a little rant but after reading threads like this I realize the insignificance.

LMAO!  +1

If you're at home alone, I would hope you could go to 11.

Sorry to hear.  MY wife's parents/grandparents are going through it now -- her grandparents are both in their mid-80s and the grandmother's mind has been slowly going for a few years now.  There were very small signs as early as ten years ago, but we can see the deterioration with each passing year.  Last visit to our house, six adults in the room, and literally, she asked the SAME question of my FIL five times in the space of about 90 seconds.

To the extent she realizes anything is amiss, she's in strong denial about it.  More combative with her husband, too, which sucks, as they've been the lovingest couple anyone has ever known.

No real help here, though, other than to say that it appears no matter what you do, it's going to be hard and there's going to be some lashing out and some guilt.  Do what you think is best, and then weather the storm.  The biggest thing, IMO, is not letting the Alzheimer-afflicted person's behavior taint the memory you'll carry of the real person.

My grandmother is 93 years old, still sharp as a tack, and will probably outlive us all. Unfortunately, she spends all her time worrying about how none of us are going to join her in the Celestial Kingdom and is chronically depressed. I don't think anyone at her age should have that kind of sadness or pressure in her life, but such is the nature of the Church she has chosen. 

I agree with the first part, but I would bet that she had absolutely no choice on what church she belongs to.

AD isn't the only neurodegenerative disease out there. 

For example, I lost an older uncle recently to Pick's.

One thing I wonder, because you characterize your mother as argumentative, is whether you'd conclude a personality change is more prominent in your mother than is her apparent memory loss?   

I know you said she'd had image scans, etc.  But my understanding, which is probably ancient history, is that that stuff isn't very useful in these sorts of diseases, at least early in their evolution. 

You'd be wise to take her for a complete evaluation by a competent neurologist, preferably one specializing with the aged and neurodegenerative disorders.  I'd think about going to your nearest academic medical center.  They love the tough/subtle cases.

ps, my own mother, in her mid-70's, is 'forgetful' and has been for years..at least a good 10 years.  I've not been too worried about it mostly because it has never really seemed to progress to something worse; in other words, the extent to which it has worsened has been achieved very gradually.  Instead of telling me the same store twice in one visit, she'll tell it to me three times.  But I don't correct her, or point out its deja vu, because usually its a story that is important to her that day...and usually its a good one, worth hearing again, and again, and again....