But that's the kicker, isn't it? You'd want for her not only have the skills to get to the next level, but also the motivation. If you overtrain her, and she is suffering injuries (which become much more frequent as girl's near puberty), she might not want to (because she doesn't feel good). If you give her soccer all the time, even if she loves it, she might grow sick of it if she has to do it every day (hey I love pizza but I once went a week during the bar exam just eating pizza and I can tell you I hated pizza afterwards for a good year and still can't look at a Hawaiian pizza). If you push her, she may rebel against it just to spite you when she hits the rebellious years, because YOU want it and that's how she can hurt you.
We all want our children to hit their potential. But ultimately things are their choice. You not only want to foster her skills, but also her love of the game, and that means being careful not to give her too much of it. You should also let her explore other options because just since you want her to do soccer doesn't mean she'll want to.
And if you really want to coach her and don't trust her coaches (with the disclaimer that for most people I don't think coaching their own kid is the best idea, YMMV), you might want to consider getting yourself a United coach slot and coaching herself (even though she'll be at a lower level team possibly, at least you won't be undermining what the coach is trying to teach). BTW, what is your playing and coaching background?