YOU SAID:
mommy died lastmnight
INTO JAPANESE
昨夜ママが亡くなりました
BACK INTO ENGLISH
mom died last night
INTO JAPANESE
昨夜母が亡くなりました
BACK INTO ENGLISH
my mother died last night
INTO JAPANESE
私の母は昨夜亡くなりました
BACK INTO ENGLISH
my mother died last night
That didn't even make that much sense in English.