not a trick question

[redcrx]

This is not a trick question. It is as it reads. No
one I know has got it right.

A woman, while at the funeral of her own mother, met a guy whom she did not
know. She thought this guy was amazing. She believed him to be her dream guy
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 is her motive for killing her sister?

[enigma]

How many ABers do you imagine got the right answer though but on reading that it meant that you thought along the same lines of a psychopath , decided to keep schtum ? I usually kick myself if I can't work something out but on this occasion , i'm glad too that I didn't have the right answer ! I'm going to test all my family though and see if we have any psychopaths lurking amongst us lol !