How do you grieve for someone who's still alive?

So, my Nana has dementia. She's been in a memory care facility for a while. My aunt was taking care of her for a few years before that.

My for-all-purposes-stepmom called today to let me know that Nana isn't doing so well. Nana is pretty old, true. She's been missing my Pop-pop for over a decade (when she's aware that he's passed on. Sometimes, she just wonders why he doesn't come to see her). Her kidneys are failing. She's been put into hospice care.

I tried calling her today. She couldn't hear me over the phone (She wears hearing aids). She sounds healthy and in good spirits.

My stepdad has dementia. My mom is his primary caregiver. She puts up with a lot of verbal and emotional abuse. Gaslighting is a regular thing. It would be easier if we knew HOW accountable he was and when he was really lucid. He's not the same person he was. He told my mom that he loves her (he's sad that she's going to be moving up here soon. His children are stepping in to help take care of him. He's rather burned some bridges with two of them ... if he's not happy about a situation, it's like he goes out of his way --wittingly or no -- to ensure that NO ONE is happy). ... she responded that, with how he's treated her the last couple years, it's rather hard to believe that.

I don't like dementia.

I don't like any of its forms.

I don't like mourning people even before they've passed.

My Nana is still really sweet ... maybe even sweeter than she was when I was little. She (last we visited) still knew who Michael was, I was, and the kids are. That's pretty good. She doesn't recognize one of my cousins, which is sad.

I try to write Nana letters. I hope that she stays with us long enough to get this one.
I find it hard to write Nana letters ... not because I don't like to write or because I don't love her ... but because I find it hard not to write some of the things that I'd want to say ... because I don't want to take a chance of hurting her or confusing her.
"I miss who you were."
"I wish that you remembered [S] when you saw her."
"I love seeing you, but I hate crying afterwards."
"I wish that you were closer and could come visit our new house. I think you'd love it. I wish I could ask you about some of the features, since you might have an idea of what they were intended for."
"I wish that you knew that Pop-pop isn't avoiding you and that he hasn't abandoned you."
"I wish that I could take you to the temple while you're alive ... but I am planning, as soon as I can, to do your work and get you sealed to Pop-pop. I miss him, too."
"Thank you for always asking after my mom when we visit you. It makes me feel better to know that you really do love her -- even though things were REALLY ROUGH (especially for her) after the divorce. I wish that my dad had told you that they were separating before you found out from someone else in town."
"I miss going to your house when I was little. I miss you serving me fresh strawberries with cream and sugar. I miss your clam chowder. I miss how your house smelled. I miss dressing up with [S] in your nightgowns. I miss how you would buy us matching Christmas presents and she and I would go and have a fashion show after we opened presents."
"I miss how you'd tell me stories of when I was little." "I miss how when I'd call you and as soon as I'd say, 'Hi, Nana!' and you KNEW it was me, since I'm the only one who calls you that -- or you'd call up and ask to speak to 'Princess Budderfwy,' since that was your favorite mispronunciation of mine when I was learning to speak. No one else calls me Princess Budderfwy ... just like no one else calls me an 'onery little critter' like Pop-pop would. And, really, I did deserve that."
"I miss playing Megan and Sundance when I was little, even though you weren't wild about giving me horsie rides on your back when I was 5 and you were fifty-seven (or so)."
"I miss how you were ALWAYS 57 whenever I asked how old you were. You will always be 57 to me. I am constantly getting closer and closer to getting as old ... and older ... than you." "I miss going to musicals at the Hult Center with you."
"I miss going shopping with you."
"I miss walking to your house."
"Do you remember that silver patent-leather pair of Sketchers you bought me when I was, what, fifteen? And how you told me about the looks people gave you -- an old lady trying on silver sneakers -- since you and I had the same shoe size? I kept those sneakers until they were falling apart because they made me smile every time I saw them and remembered your story. I might just go buy another pair of silver Sketchers for that reason."

I don't know about you ... but I think I'm going to go sit in the shower and cry.
I hate it when people go where I can't follow. I hate it when dementia changes people.

I need to get control of my emotions before the kids get home.

As my stepmom said, Nana's gone into hospice care. We don't know how long she has. It could be soon. Or it could be months down the line. We don't know.

Honestly, it would be a bit easier to have more of an idea.
We had been planning on going down for a visit on what was the weekend AFTER Pop-pop passed.
The kids are in school. There's soccer and General Conference. I have meetings and activities that are a bit harder to work around ... but ... I could just pull the kids out of school and take one day off if we need to.

Once I can talk without sounding stuffed up and weepy, I think I'll call my aunt and ask for their plans. Once I can get to that point.  (Oh, why can't everyone just text. It's easier to conceal my emotional nature that way.)