i think more another type of dementia - not sure Alzheimer’s causes outbursts of inappropriate laughter (like during her Benghazi testimony, and when being interviewed and asked serious questions she burst into prolonged laughter- maybe Alzheimer’s does this too- I dunno
I think the outbursts of laughter are just calculated. She’s trying to say: “Oh, THAT! THAT old news! THAT thing the Vast Right-Wing Conspiracy just won’t let go of!”
I don’t know about alcohol but I believe Hillary has suffered a stroke. She has a history of blood clots and her father died from a series of strokes. She is older and on the visual evidence takes no exercise. Read the clues.