Who do you agree with?

Awhile back my friend asked if i wanted to go to a party, i said yes and she said her mom would drive me. We both wanted drinks for it and my mom bought them and we both agreed we would pay her back when we got the chance. A couple weeks later i asked her if she had the money for it and she says "i think its fair that i drove you to the party so i dont have to pay for the drinks ". i didnt agree and we got into an argument and i didnt think it was fair that i had to pay back my mom but she didnt. Eventually she did but she was mad 🙄 who would you agree with?