YOU SAID:
She's our friend and she's crazy.
INTO JAPANESE
彼女は私たちの友達ですそして彼女は頭がおかしいです。
BACK INTO ENGLISH
She is our friend and she is crazy.
INTO JAPANESE
彼女は私たちの友達です、そして、彼女は頭がおかしいです。
BACK INTO ENGLISH
She is our friend and she is crazy.
That didn't even make that much sense in English.