I encouraged my mother, who had short-term memory issues _and_ dementia to write things down. It backfired. She's write something down, like the fact that she got a call from her gardener, then obsess over it. She'd open the book over and over and then talk about the "odd" call she got from her gardener for weeks! We had to take the book and write things like "This issue has been resolved" under the things she wrote down.
I think an e-ink that we control remotely might work for her, too. We can put an item up there and then remove it as soon as it's not relevant anymore so she won't keep re-reading it and obsessing over it.
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