S.B.
I think the competitive drive might be something that each child is born with, or without. I am not a competitive person by nature. I played soccer at age 8/9 and just enjoyed it for what it was worth. I went to practice each week, did the drills and came home and put the ball up... If we won, we won - if not, I moved on...
Now, I can't say the same about my 4.5 yr old. She is extremely competitive and has been so for as long as I can remember. She does not like to be last, does not like to lose, and is determined to be heard when she has something to say. As much as I think it is a good thing, there are times that it is equally challenging, especially when she is at school and an outcome does not turn out as she would like.
Sounds like your daughter just likes to play soccer, just to play. It also is more than likely not the thing in her life that she has to be a literal winner & the absolute best every time she participates in a game. I wouldn't push it too much at this point, especially if she is doing it because she wants to play soccer and chose to do so on her own.