This is not a riddle. →[More:]If you have seen this question, please don't answer just yet. There is no wrong or right answer. It is not a trick question or a riddle.
Here is the question:
A woman is at her mother's funeral. There she meets a man, who is a friend of the family but she doesn't personally know. She is captivated by him but he leaves without her getting his name.
The next day she kills her sister.
Question: What is her motive for killing her sister?