YOU SAID:

at least she lived a very long and I'm sure happy life

INTO JAPANESE

少なくとも彼女はとても長生きしたし、きっと幸せな人生だったに違いない

BACK INTO ENGLISH

At least she lived a very long life and must have had a happy life.

INTO JAPANESE

少なくとも彼女は非常に長生きし、幸せな人生を送ったに違いありません。

BACK INTO ENGLISH

At least she must have lived a very long and happy life.

INTO JAPANESE

少なくとも、彼女は非常に長く幸せな人生を送ったに違いありません。

BACK INTO ENGLISH

At least she must have lived a very long and happy life.