Nothing that we say will matter. She will do it anyway. Experientia docet...experience teaches. When she curses her ex boyfriend or whoever it is to die, and 2 or 3 others end up hurt or dead because of it, maybe children or possibly even friends of hers, she'll realize why curses are to be used with caution. =)
Becareful what you wish for my dear, you may get it and quite a lot more that you didn't want with it.
I think what would help is what this person did to YOU. Did they hurt you? Did they do something worse than hurting you really bad or killing you (yes, there are worse things than dying)? Do you know EXACTLY why you want to do this? Have you thought of EVERY possible consequence? Once you answer all these questions, I can try to help you. There just isn't enough info to act yet (I'm a deep thinker and sometimes there's something different you could do).
When people want a death spell i ask "Would you be able to kill this person with your bare hands if you knew you would get away with it?"
Death spells often work like that - the person slowly wastes away. The spell attaches itself to the weakest body system and eventually kills them (usually - sometimes people die in "freak" accidents). Like if a person had high blood pressure or heart disease, the spell could manifest as a heart attack.
Also, are you able to continue to work this spell as this person wastes away in front of your eyes? While they're in the hospital surrounded by their weeping loved ones, are you able to keep burning candles, praying for their death, visiting the cemetary and holding a spirit burial for them?
For some people, it is a resounding YES! That's not my judgement to make.
Search through hoodoo spells - hoodoo has a rich tradition of enemy work. Check out the spell archive at LuckyMojo.com. You will find everything you need there.
Perhaps even a banishment (hot foot) or a reversal spell (return all their hatefulness back to them, not on you) will be more to your liking. In my experience, probably 75% of people who were set on a killing spell eventually settled on a reversing spell. My favorite reversing spells are mirror box spells using doll babies. You'll be able to find such spells on the site i referenced above.
