I think her pathway makes for a great story. She is a freak athlete and seems like a genuinely nice person.
However you seem to miss the obvious counterpoint to your argument that US Soccer would instead probably consider her the poster child for why DA is needed... "As amazing as she is, can you imagine how good she could have been if she focused on soccer instead of splitting her developmental years amongst multiple sports?"
I assume US Soccer looks at a player like that whose ceiling was perhaps becoming the best player on the planet (but instead apparently topped out as squad depth for the best team on the planet), and thinks this is even more reason to implement the DA environment.