Is there anything I can do for my 97 yo grandmother?

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Over the past two years, she’s developed dementia. Up until 95, she was very lucid and always recognized me, but now, she asks me who I am much more than she recognizes me, and I’ve lived with her for a year, sleeping on her couch every night.
The thing that saddens me is that every so often, maybe once a month or two , she’ll wake up extremely lucid, like she was a couple years ago, and shel remember me and ask me about my life. I just want her to preserve her memory of me, and recognize me.
Is there anything I can do now, supplements or medications , life style changes and such that can best help her get back to even just 2 years ago, where I’m not a stranger even though I live with her for a year