Struggling to accept that my mother has passed (Assalamu alaikum)

Assalamu alaikum. I wrote about my dear mother yesterday and the kind messages helped, but I still have so many questions and a lot of anger. I know this is probably grief and maybe whispers from Shaytaan. Why didn’t Allah allow us to keep my sweet mum until she was old? Why did He take her from so many future moments? Why did she lose the things that made life human one by one - eating, bathing, walking, speaking, breathing? A woman so devout and gentle had to go through that. Didn’t she deserve a peaceful, dignified passing? I keep wondering if her death could have been prevented. The hospital seemed to misdiagnose her for two weeks and by the time they saw what was truly wrong she was too far gone. I’m overwhelmed and in so much pain. I talk to Allah out loud, I read and try to learn, but it’s so hard when I don’t know the deen as she did. I don’t have that same bond or certainty she had. Why would she suddenly get this pain and be gone two weeks later? Other people I know had different timelines - one friend’s mother had months to fight and passed peacefully, another is still undergoing treatment and expected to recover. You didn’t see how she suffered at the hospital. She kept going because I sat with her every day and because she put her trust in Allah subhanahu wa ta’ala. But I feel angry that this happened to her, to us. I know feeling that way is wrong, but I needed my mum, we all did. Now I’ll watch my peers grow older with their parents still here while my loving mother is gone. Why would the Allah she loved so much allow this to happen to her and to us? I’m scared I’ll be held accountable for these thoughts, but I can’t stop them. Please make dua for her and for me, that Allah grants her mercy and gives me sabr.