It is life. Not everyone can be the best or great at everything let alone a few things. Just try your hardest. (looks like your tryouts may have passed already). Seek help, ask questions, show team support and camaraderie. Don't worry about your other team mates and how they play. This is about you. You need to be the best you can be. Just because you might be better than one of the girls at some things, there is a possibility that the coach see's something different than you do. Realize she see's both of you in action, you can't really see yourself. How you make your approach, if you call the balls (speak and say and help point out things) I go I go, I got it, out out out...in in in, dink dink dink, block block block, short, long....things like that. If you don't or are not as vocal, and the other girl is, the coach may favor her for her ability to see and call plays and team spirit and support.
Just keep working on you. It is all you can do. Good Luck!