Alright from what I understand you guys are good friends so that has you on a good note already.
Do you ever do anything besides soccer with her? If not that's ok.
I think the next time when you feel it is right ask her out in person. DO NOT text her the question it shows courage that you can go up to a girl and ask her out.
She may say no and that your a good friend. Just be prepared for this answer there are many more girls out there that you will find a liking to in the future.
If you do get her to go out with you you can go and see a movie or just hang out at either of your houses. Remember just be your self and talk about the every day normal things. If you don't focus on the relationship it's easier to start up conversations.
If she does say no we can work that one out a little also. So it's kinda up to you now to go and get her.
I'm pretty confident that she will say YES to you.
Best of Luck
