Don't be afraid to make the hard decisions...our healthcare system isn't set up to deal with something that won't have a good outcome. Love her enough to make the hard decision when it is time.
Take care of yourself.
I agree with the suggestions of music and singing. End stage for my mom, no talking - but I would 'mimic' the sounds she made, like her own song and she would sing, "I love you" when I 'joined ' with her in this way.
Blessings to you on this path.
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