YOU SAID:
heads over heels for her
INTO JAPANESE
彼女のためにかかとを頭に
BACK INTO ENGLISH
Heels for her head
INTO JAPANESE
彼女の頭のかかと
BACK INTO ENGLISH
Heels on her head
INTO JAPANESE
彼女の頭のかかと
BACK INTO ENGLISH
Heels on her head
That didn't even make that much sense in English.