YOU SAID:

For years she was being tortured by something

INTO JAPANESE

彼女は何年もの間、何かに苦しめられていた

BACK INTO ENGLISH

She had been suffering from something for years.

INTO JAPANESE

彼女は何年も何かの病気に苦しんでいた。

BACK INTO ENGLISH

She had been suffering from some illness for many years.

INTO JAPANESE

彼女は長年何らかの病気に苦しんでいた。

BACK INTO ENGLISH

She had been suffering from some illness for many years.