I'm not sure which specific 'killer grandma' story you are referring to. There could be various real - life cases where an elderly woman has committed a crime. Maybe it's about a grandma who had some psychological issues and ended up harming someone. Without more details, it's hard to be precise.
Jealousy might be a motive. For instance, if she felt that another family member was getting more attention or love, she could have lashed out. Another aspect could be mental illness. If she had an undiagnosed or untreated mental disorder, it could have led to violent behavior.
It's purely fictional. Usually, such names for stories or movies are made up to attract the audience with a thrilling and imaginative plot rather than being based on real events.
I'm not sure which specific 'Killer Grandma' true story you are referring to. There could be various real - life cases or urban legends about a 'killer grandma'. It might be a story about an elderly woman who committed heinous crimes for some reason, like financial gain or mental illness.
There are several potential motives. It could be due to a mental disorder that made her lose touch with reality and act violently. Or perhaps she felt threatened in some way and thought killing was the only way to protect herself. It's also possible that she was influenced by someone else who pushed her into committing these crimes.
I'm not entirely sure which specific 'Killer Grandma 2019' you're referring to. There could be a movie or a documentary with such a title. If it's based on a true story, it might involve a case where an elderly woman committed some sort of heinous act. But without more context, it's hard to say exactly what it's about.