Playing flute for my grandmother in the Alzheimer's section of her assisted living home today - what to expect?

I visited her last week and it was my first time dealing with Alzheimer’s patients – even my grandmother, whose health has deteriorated drastically since I last saw her. There will probably be about 10 – 15 people in their “meeting area” to listen. I’m planning to play slower pieces in the lower range of the instrument – I definitely don’t want to bust up in there playing stuff that’s fast, high, and loud.

Apparently there’s a lady there who will randomly start yelling at you for doing something like, say, pick up a blanket off the floor….not sure how to react if she starts screaming at me today. I’m used to a very different audience obviously. I usually like to talk between pieces to introduce them, but I’m not sure I should do that here. What should I expect, overall?