YOU SAID:

i didn't know she was 11

INTO JAPANESE

私は彼女が 11 とは知らなかった

BACK INTO ENGLISH

I didn't know she was 11 and

INTO JAPANESE

私は彼女が 11 とは知らなかったし、

BACK INTO ENGLISH

I didn't know she was 11 and then

INTO JAPANESE

私は彼女が 11 とは知らなかったし、