I think you’re infantilizing her. Either she’s old enough to make these remarks and take criticism, or she is too young to be given credence. You can’t have it both ways.
As for the specifics of the grievances, I don’t think any of us know enough to say one way or the other, but I don’t think we should just take her word for it. And mostly my objection is about the tone and focus of her criticisms, which seem really centered around how things impacted her. She does not speak to systemic problems, or issues that other students are facing, she’s only concerned about herself.
When I was in high school, my guidance counselor’s involvement in my educational planning came down to giving me a test that suggested I’d be best suited to outdoor manual labor (I have a JD now, but she wasn’t wrong). Books of scholarships were available in the library for students to peruse whenever they liked. And you know who I blame for not getting into an Ivy League school or getting a full-ride to college? Me.