It will be on a dead sims grave

is it on a skeleton or one of my party? because my sim is alone.

Near a tomb.

A sims tomb or like the llama people?

it'll be on a sim death place

When one of your sims die another sim has to go and mourn them then they can pick the
death daisy off their grave. If you only have one sim and it dies im guessing you would
have to start your game over. but if you keep your sim healthy you wont need the death
daisy because it wont die!