I am so sorry for your loss RandomGuest, no matter the age it doesn't diminish the grief or sense of loss. Moving on without your loved one is very hard but I hope you can find solace that she is at peace and you can celebrate her life. My dad passed away due to dementia recently and we dreaded Christmas without him but we decided to do everything we normally do and had a great time, lots of laughter remembering him, I don't think I will ever stop smiling when I think of my dad. We really did celebrate his life and will continue to do so. I hope it is the same for you when you think of your Nana.
Take care
LG