As another parent pointed out, unfortunately "welcome to the political world of sports." However, the other cliche to consider, is "you get further with honey than with vinegar." By this I mean, you need to start with complimenting the coach. People respond more if they are not put on the defensive right way.
If you can't think of something good to say to the coach or his ability to coach the team, start looking!!!... or at least express gratitude for his willingness to coach. As you know, coaching is a selfless job and many parents take it for granted -- wanting to blame the coach for everything and not willing to work with their own child on the side away from the few practices scheduled to help improve their kids' skills, behavior, or attitude.
At any rate, what I am suggesting is "YOU" have to talk with the coach. If you start pulling other parents, or go around the coach, you have lost the battle. You have immediately "attacked" the coach and not tried to handle this parent to parent. Sometimes, a coach just needs to be "politely" reminded or directed to considering something that you feel is out of place and then perhaps he will realize it himself. And if you do this without pointing the blame right at him, the conclusion and solution may come about quickly.
For instance, if you started with complimenting the coach on a drill or a play that seemed to work well for the youngsters, and then asked him about himself and his background. Did he play in HS, college? --- really just try to get to know him alittle first, which can be done in a matter of a couple minutes.
Then point out that you are concerned about your daughter and wonder if HE has any suggestions on how you can help draw her out, build her esteem (without blaming him for her recent withdrawal of attention). Point out that last season she seemed to be more assertive in her playing and yet this year she doesn't seem to be playing to her potential -- it may be that she is intimated by the larger players, or yes, it could be that the coach is neglecting her.
But if you don't phrase it that the coach is the problem and seek his help in the solution (helping her play better, build self esteem), you have then accomplished the objective -- it starts putting your daughter on his radar while he is coaching. He may start calling her name more.
Keep in mind some coaches are terrible with names and if the kids don't have their name on their shirts, it makes it harder for the coach to get to know the kids and interact. (We had a great baseball coach that was very upfront with this weakness and the solution was simply that the boys wore their baseball shirt for practices and games...)
You may find this might simply be the problem - your coach does not KNOW your daughter. Also, your coach may reveal something about your daughter you didn't realize or didn't think he even noticed (hopefully it is on the positive too).
Take the time when you talk to the coach to introduce your daughter... (of course, do the talking with the coach before or after a practice/game when he is less distracted)... Say something like, "Bryana, your coach ____ and I have been talking and he is really happy with your ______ ..."
What you are done is now put the coach and your daughter in a newfound relationship. Now your daughter may be more willing to listen and be attentive and hopefully your coach will call on her, help direct her skills and play time....