phsycopath test: answer this question

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read this question,come up with an answer. i will post the answer this sunday.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. shwe 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 his number and could not find him. a few days later she killed her sister. QUESTION: what is her motive for killing her sister? [give this some thought before you answer]For the first correct answer i will give the best reply