YOU SAID:
She didn’t die of natural causes
INTO JAPANESE
彼女は自然の原因で死ななかった
BACK INTO ENGLISH
She did not die due to nature
INTO JAPANESE
彼女は自然のために死ななかった
BACK INTO ENGLISH
She didn't die for nature
INTO JAPANESE
彼女は自然のために死ななかった
BACK INTO ENGLISH
She didn't die for nature
That didn't even make that much sense in English.