YOU SAID:

Didn't know she did that

INTO JAPANESE

彼女がそれをやったことを知らなかった

BACK INTO ENGLISH

I didn't know she did it

INTO JAPANESE

彼女がやったことは知らなかった

BACK INTO ENGLISH

I didn't know what she did

INTO JAPANESE

私は彼女が何をしたのか知りませんでした

BACK INTO ENGLISH

I didn't know what she did