YOU SAID:

I said that that's what she said

INTO JAPANESE

私はそれが彼女が言ったことだと言った

BACK INTO ENGLISH

I said that was what she said

INTO JAPANESE

彼女が言ったことだと言った

BACK INTO ENGLISH

She said what she said

INTO JAPANESE

彼女は言ったことを言った

BACK INTO ENGLISH

She said what she said