For me, the bottom line is that the people doing the evaluating are those paid by US Soccer to do the evaluating and coaching and they are incentivized to choose wisely. That is pretty much the same model as everywhere else in the world.
They have set up a process to select national teams, and it is largely the same as most everywhere else in the world. It involves scouting and input from trusted colleagues that generally lead to invites to regional training sessions. Those that stand out, get chosen to move onward to more selective sessions, culminating in building a team for Youth World Cups.
We are a big country. I don't see an obviously better way to do it. They surely get choices wrong sometimes, but that is the nature of things everywhere. I don't see any evidence, at all, of any obvious bias or crookedness in the process.
I think you're very unlikely to fundamentally change things, and I am unconvinced you actually have a better way of doing things, anyway. I would just recommend you jump into the well-established process and, if your kid is as good as you say she is, I imagine those in charge will be quite happy you did and that things will work out quite well.