I would ask her, "What's it like down in the rabbit hole?", though I don't know that it would receive a favorable response.

Like many philosophies, the growth mindset idea is quite useful. And like most philosophies, even the quite useful ones, dogmatic adherence to them in all situations leads one down the metaphorical rabbit hole. For instance, John Locke had a great many good ideas, but even in his own writings he'd explore the application of one of his ideas, and then pull himself up short, because he noticed that the next logical conclusion was going to fly against all good sense. He simply refused to follow those ideas down the rabbit hole. Others came after him who did, and the result of that work was a rejection of rationalism altogether, leading to highly-influential, highly-destructive philosophies from the Romanticism and German Idealism movements to take its place.

For her part, Ms Dweck seems particularly eager to follow her own ideas down the rabbit hole, supporting them against good sense wherever they are in conflict. That's a shame, because much like rationalism, the growth mindset has its place, and a valuable role to fill. By being her own philosophy's worst enemy, she risks having it subjugated to far less beneficial ideas.