I can second everything in this post.
Lilstriker, I'll also add that we went through an almost identical phase with our DD. Her first year playing on the "A" team at a big club, we experienced all the discomfort you described, especially the parent situation. That sideline was so high strung, it was easily the most miserable season we had as parents watching our kid play. But we survived, and so did my DD's love of the game. Of course, we did move on to a better situation (not all A teams are like that, but there are plenty). Looking back, although that year sucked, it was a learning experience and we are wiser now because of it. And here's what we learned:
Playing on the "A" team, or an ECNL team, or a DA team, or an Ivy league team, or the freaking National team doesn't mean s^!# if she's not enjoying it.
There's plenty of miserable people playing elite level sports or attending Ivy League schools. For god's sake, don't make that the goal. Focus on the process, not the result.