You too @LadyMacbethWasFierce , I'm so sorry to hear about your daughter. It's truly awful. Sending so much love and thinking of you. 💐
For us, even before the dementia took hold of my mum, the death of my sister changed her, she was a chatty, bubbly person before with a sharp tongue and was always so confident and clear thinking. She lost her confidence a lot after losing my sister. My dad was more bereft at the beginning of the grieving; I moved back in with my parents to help them when my sister died, even though I had just turned 27 when she died. My dad didn't go back to work for about 8 or 9 months, got prescribed anti depressants and for the first few months wouldn't get out of bed. So my mum just had to try and get on with it, I could see in her eyes she wasn't the same person anymore but she just tried to help my dad through his grief.
Like your younger daughter, I too felt so angry about losing my sister, the strong bond we had, it's horrible and I miss her so much and people who just meet me now will ask if I have siblings and I always say yes, I have a sister, she died, I won't say I'm an only child because I'm not. It's been 15 years since she died and a few months since my mum died. I am grieving them both, it's weird as I thought I was "okay" about my sister (in the sense that I no longer cried talking about her) but my mum's death recently has just set me back again.
I hope you and your daughter can take comfort in each other as well, that's what I did with my parents in the immediate aftermath. My dad has been saying for years how strong women are, he said he is so lucky he had such a strong wife and two strong daughters. My sister's attitude and positivity during her cancer treatment was amazing to witness, she kept us all going.