How do I get my friends mom to like me again?

Last night I went to my best friends soccer game. (She's the goalie) While I thought I was talking privately to my friend, I told her that she did a great job, and defense was good, but I thought her team's offense kind of stunk. Her mom overheard me, and yelled at my friend. She thinks that because I said that, her daughter will get kicked off the team or beat up by other players. Nobody else knows I said that! I tried apologizing, but I still think her mom is mad at me. What should I do?