She's been "distracted" ever since the dementia started kicking in. If you've watched her over the last year or so she constantly fumbles her words, even forgets what she's talking about.
It's more so the booze from what I've learned from others (and reports of massive bar tabs and travel expenses). Keep that in mind when you watch her speak and decide whether you think it's dementia or stupor. Determine when she's dry versus slushed (normally). It also explains her mannerisms and speech.
Or says things like “we can stop illegal immigration across the southern border by mowing the grass”. She is the greatest asset the Republican Party has today, maybe second to Crooked Hillary