YOU SAID:
She had her whole life ahead of her and she wasted it
INTO JAPANESE
彼女には人生のすべてが待っていたのに、それを無駄にしてしまった
BACK INTO ENGLISH
She had her whole life waiting for her and she wasted it.
INTO JAPANESE
彼女は自分の人生をずっと待っていたのに、それを無駄にしてしまった。
BACK INTO ENGLISH
She had been waiting all her life and wasted it.
INTO JAPANESE
彼女は人生をずっと待っていたのに、それを無駄にしたのです。
BACK INTO ENGLISH
She had been waiting all her life and wasted it.
That didn't even make that much sense in English.