Oh Corvus, that would be very, very hard to witness, I am sorry for the way you are all suffering.
You have clearly done so much to be supportive and carried such weight for some time. I'm sorry that your mother was not able to directly acknowledge all you have done and how she felt by sharing what was in her heart. People can be strange about this kind of thing sometimes; there are times when I notice often this is a learned behaviour, a mirror of how they were treated themselves by their own parents.
I wondered if perhaps she hoped others would eventually share her praise and acknowledgement of you; if this 'feedback' came indirectly, it might help you to know she was truly grateful because she was letting others know what you had done for her (therefore honouring you, showing recognition, affirming who you are to others and openly acknowledging what a wonderful son you have been - so everyone is aware). Perhaps also at the heart of things she really struggled with talking about her gratitude and what you mean to her because it also meant she would have to talk of her potential passing and ultimately discuss her feelings / fears. She clearly has been confronted with overwhelming and frightening thoughts about this and perhaps has tried to escape the potential reality through dissociation or denial.
In truth, when you speak about how she was when your father passed, it sounds as though that truly broke her heart. It seems she received some kind of precognitive 'download' about his passing as well as her own more recently - I think anyone would find that very confronting! Deep down her greatest fear may possibly be that there is 'nothing' beyond this life, that without your father and without you, she might believe she will be completely 'lost' or cease to exist in any form.
She was also under lot of stress, worrying because of sisters situation and her immaturity, selfishness but that is a different story I do not have time to write now. She also had hard life from upbringing to war years and after, but was a good person, excellent cook, very hard working person when it comes to cleaning, making food(she worked as a cook all her life), and always greated people, friends and family with warm wellcome. She also had her flaws like everyone but was ready to help as much as she could.
Your mother sounds like a good hearted, hard working decent souled being who regularly gave her best to others - and also instilled strong values in her equally good hearted, hard working son. The way you describe her above I think says a great deal about her soul essence and at the very least, she deserves to be reassured that the life she has lived was meaningful, that she will always be loved and appreciated, that you have learned a lot from her. Also that she has so much to look forward to, in a place where there is no more pain and suffering; instead greater awareness, wisdom, deep healing and powerful rejuvenation. I think it is important to emphasise that when a souled being separates from the body, it never dies... instead it has the potential to get lighter and brighter; and definitely I would remind her to look for your father - but also that he may look a lot younger, stronger and much happier than when she last saw him.
Prayers for Grace and Light to embrace you all. I pray that your mother can trust what you share with her about transitioning, open her soul fully to this and focus on positive thoughts about reconnecting with loved ones. Like others have said, it doesn't matter if she is conscious or not.
Music
like this might also might help her open up to the Light and facilitate a bright transition, but you would have to decide if that was appropriate, if you think she would find it calming and beautiful. You could read the words to her quietly, it might bring her some comfort. I found this particular song very cleansing and deeply comforting.
I pray that after all your mother has endured that she has a bright and swift transition into the Light
and that you can all find peace and deep gratitude for your time together.