YOU SAID:
My wife has a shaved head
INTO JAPANESE
私の妻は頭を剃っています
BACK INTO ENGLISH
my wife has shaved her head
INTO JAPANESE
私の妻は頭を剃りました
BACK INTO ENGLISH
my wife shaved her head
INTO JAPANESE
私の妻は頭を剃りました
BACK INTO ENGLISH
my wife shaved her head
That didn't even make that much sense in English.