may be you need to see if it is really necessary to use repetition "I sit by your side"...may be change the words but implying the same....if i read it right, it's about a father and his daughter sitting near his coffin / grave and feeling lost about not having been able to express enough while he was alive...
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A write that was from your soul feelings, there are times when we must let go but they never leave.
They are but a thought away, it is us that must put a perspective on life, if it be through the passing of someone then so be it.
Sometimes it brings relief to us but that is only followed by guilt..
Over the past few years I have lost all of my family bar one Sister, the family I grew up with of Mother Father and three Brothers and four Sisters, and sometimes you have to sit and ask why??
A good write but just needs a tidy of repetition, there are other words you can find to elaborate the feelings.
Good luck and keep writing we are all armatures no matter what we say. I have been here for 10 years or around that time and we can only improve ..
Yours Ian T x

the revisions look good and so too the rhyme sequence....

one suggestion:-

How is this fair could be changed to How can this be fair
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This poem brought back my father's death. At first, it would appear the poems is about advanced dementia until the poem seems to shift into the death, (encased in wood).
I would suggest finding a way to separate this passing (unless I'm missing something here), I got a bit confused in the narrative. I also have am not sure of the last line....being "good" ..the poem has so much emotion, so much of what we feel in the presence of a parent who has lost it, and is fading. In the end my dad even forgot how to swallow and so quickly just went in a few days, as he had a living will.
I know how hard it is to put a closure on a poem like this, which is very successful in the narrative to include the reader. The empathy is there. One way to perhaps make the last line more powerful is to turn it into a question... as you are addressing your father, stay in the first person. (we don't need "I love you" as that is quite evident)

I sit by your side, you encased in wood
I miss you, O stay by my side for now-
This time of ours, was it not good?

Anyone who has experienced such a loss will be engaged by your poem. One that is quite hard to write. Its been a few years but I still grieve for our losses.

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It is heartbreaking poem, I relate very much.
The line
I curl in a ball and prepare for the end
gave me shivers.

In short, you have created a jewel.

My only suggestion is that the rhymes are too perfect and a bit distracting to my taste.
It is a subjective, very subjective opinion
For example, I love the first and second lines,
they place me right at the bedside, sweet and tart is honest and fresh image.
then the third line kills it.

It is a perfect rhyme, and pearl feels like it is an invader.
you didn't think about pearls looking at her face
but yes memories are precious.
So maybe, compromise the form and forget the pearls?