Or have I misunderstood, and you're simply expressing sanguine resignation to the inevitability of extinction events, on planetary timescales?
Why do people repeat this platitude as if it is at all obviatory (or even relevant)?
> I wanted to believe in the limitlessness of resilience
That's irrelevant, as the other times we weren't 8 billion of us, in a highly fragile, interconnected, civilization, with thousands of cities and hundreds of megacities, for the impact to be the same. Nor is the mechanism for the current issue (or the speed of it), as explained by scientists within the current consensus, the same as those times...
She doesn't remotely seek to conflate her brother's mental illness to climate change. She is simply juxtaposing a personal experience with her brother to a professional observation she has(and sources).
Moreover, you clearly didn't read the whole thing because your entire last paragraph is filled with points she made and addressed in relation to her thesis regarding memory, both ecologically and humanistically.
And no, despite all the doom and gloom the author projects, this is not the first time in history that glaciers are melting en masse worldwide. They have done so before multiple times in the past and will do so again multiple times in the future. Earth has a long storied history, we have been on it a brief fraction of that time.