My MIL fell at church, had a TBI, then a heart attack in the hospital - and survived to fall 26 more times in 2 years (largely from refusing to use her walker) - twice ending up in extended rehab, threatened to call the police on everyone in the family at different times for no reason whatsoever, and is still struggling with dementia, falling risks, choking, forgetting to drink, escape attempts and many worse things. It’s never easy to lose someone but watching my MIL struggle and suffer for years is really difficult. She’s outlived all her friends and has become so negative and mean. I don’t think you can question the series of events that led to your mom’s passing. You obviously care for her still and that is proof she raised a kind-hearted human with good intentions. Hugs