I do.

You forgot to mention the Lightning-Struck Tower.
She has said a bunch of things, especially in the last book.

I think Dumbledore knows and that he's been deliberately holding her back.
Maybe for her own protection, maybe so that her information doesn't fall into the wrong hands, maybe both.
Her drinking and her pride also hold her back.
But I think her talents would be better developed with a little encouragement from her boss.