I received this in an email, and thought I'd pass it on... (No, I didn't get it right.)

Read this question, come up with an answer, and then see my subsequent post. This is not a trick question. All the information you need is provided in the sentences below. No one I know has gotten it right, including me.

A woman, while at the funeral of her mother, met this guy whom she did not know. She thought the guy was amazing, her dream man! She fell in love with him instantly, but never asked for his phone number and could not find him after the funeral. A few days later she killed her sister.

Question: What is her motive in killing her sister? (Give this some thought before you answer) then see my subsequent post for the answer.