Interesting Psychopath Test

I came across an interesting article today regarding a test by a famous American Psychologist used to test if one hasthe same mentality as a killer. It was claimed that many arrested serial killers took part in the test and answered the question correctly. It may sound lame yet Believe it or not you may be one of the potential serial killers...bwahhaha..

This is not a trick question. It is as it reads.

"A woman, while at the funeral for her own mother, met this guy whom she didnot know. She thought this guy was amazing! She fell in love with him rightthere, but never asked for his number and could not find him later. A fewdays later she killed her sister."Question: What is her motive in killing her sister? (Give this some thoughtbefore you answer).

Do post your answer and I'd be posting up the answer soon.......if you get it right...you think like a PSYCHOPATH!!