Psychology Test
This is a genuine psychological test. Read carefully!
It is a story about a girl.
While at the funeral of her own mother, she met this guy whom she did not know. She thought this guy was amazing; she so believed him to be so much her dream guy, that she fell in love with him but never asked for his number and then...
A few days later, the girl killed her own sister.

Question:
What is her motive in killing her sister? Give this some thought for a while before you scroll down. Your first thought is what counts here.

ANSWER LATER