Girlfriend forgiveness help! men and women please?

okay so today my girl asked me to come over to her house. but i couldnt. so shes kinda upset. then she gets all mad and says shes in a bad mood but wont tell me why. so she didnt text me for a bit. then she asks if i wanna go to her dance recital. i cant. i have a baseball game during that time. what should i do to make it up to her? i have to go to my baseball game. ive said im sorry but all she responds is k bye... i need help. i love this girl with all my heart. she means the world to me. i am 14 btw.