1:20 PM: Something to think about...

This is a genuine psychological test. 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, so much the dream guy she was searching
for that she fell in love with him right then and there. But she never asked
for his name or number and afterward could not find anyone who knew who he
was. A few days later the girl killed her own sister.

Question: What is her motive in killing her sister?

Post the first answer you think of in the comments. I'll reveal the answer in a few days.

Don't cheat yourselves and google the answer...that'd be no fun.