She also kept reminding me over the last 5 months that my dad wasn't nice to her and apparently beat her. - why would or should that be brought up now? I just don't understand her motives.
My father was abusive and that just made his death all the more complicated. I don't know if I could say it was more painful, since I don't think grief is a quantifiable competition, but it certainly complicates matters.
Please remember that he isn't 'just' your father, he's her ex and father of her children, and presumably she loved him once. His death is likely to bring up pain she is no longer used to feeling after 25 years of being divorced.
Maybe I hang out on different bits of Mumsnet but whenever I've heard people on here talking about narcissism I've found that they are normally pretty familiar with both the diagnostic criteria and the behaviour of the person they're potentially labelling.
I find they're never clinical psychologists, they're people who don't like their relatives. A really, really bad situation for making a serious clinical diagnosis of a very rare personality disorder.
Why do so many people want so badly for their mothers or brothers or whatever to be actual narcissists? They can still be arseholes or abusive and you don't need a diagnosis to be justified in protecting yourself from them. If anything, a personality disorder makes them less responsible for themselves, so you should be making the allowances.
I am sorry for your loss, OP. A lot of people will be feeling it in different ways.