I broke my little sisters heart, how can I make it up to her?

My little step sister is five years old and tonight I really broke her heart. You see we had a third round home volleyball playoff game tonight, and Jessica is our biggest cheerleader. We won the game and after the game Jessica ran down to congratulate me and I blew her off kind of. I didn't mean to, I was just celebrating with the team. I didn't think a lot about it, until I saw my mom with her and she was crying. I feel rotten about it. I mean my step dad (her dad) is in Kuwait and I know she looks up to me, and I feel I let her down tonight. She just wanted to be the first to congratulate me. How can I make it up to her. She is my best Friend (no drama with her lol) and I want her to forgive me. I'm sure she will tomorrow, but I just feel rotten tonight