Ramadan: urgent question please my llife depends on it well my hereafter does?

my mom told me to buy the family some breakfast today she gave me the money and everything but i was too tired so i told my little sister to buy it and now she got all mad and everything and i remebered a hadith about if you make yor mom cry you'll be cursed by Allah and now she wont even let me talk to her what do you think about this situations and what are ways i can solve it