Psychopath test

Read this question, come up with an answer and then scroll down to the bottom for the result. This is not a trick question. It is as it reads. No one I know has gotten it right. 

A woman, while at the funeral of her own mother, met a man who she did not know. She thought he was 'amazing'. She believed him to be her dream partner so much, that she fell in love with him right there, but never asked for his number and could not find him. A few days later she killed her sister. 

Question: What was her motive for killing her sister? Give this some thought before you answer, see answer below: 

ANSWER: She was hoping the guy would appear at the funeral again. If you answered this correctly, you think like a psychopath. This was a test by a famous American Psychologist used to test if one has the same mentality as a killer. Many arrested serial killers took part in the test and answered the question correctly. If you didn't answer the question correctly, good for you. 

If you got the answer correct, please let me know so I can take you off my e-mail list.