How do i persuade my mom?

ok i play soccer, nad i have a very important game. its to see who the top two players are. my coaches need me, so they say. i also have a soccer tournament. well the thing is my mom is going away to colombia for a wedding, and shes bringing me and my sister. my dad has to stay home and work. i begged my mom not to go so i can play soccer, but she wont letme. i need help. i really want to go to mys soccer game, she is really strict. what should i do or say to her please hurry. im about to break down. my dad said its ok, its only her.