The sheer volume of pages she carries in that beaded bag alone qualifies as a key moment, but honestly, her decision to modify her parents' memories is the one that sticks with me for days after a reread. It’s a quiet, brutal act of love performed entirely off-page. We only see the aftermath, the empty house. That choice frames her entire journey—she’s not just the brains, she’s the one who makes the unbearable, practical sacrifice so they can even start.
Later, her keeping Bellatrix’s knife after the Malfoy Manor torture is a tiny, devastating detail. She doesn’t get a big cathartic fight there; she endures and retains the evidence. It speaks to a different kind of strength. And of course, her logical dismantling of the Hallows legend to focus on the Horcruxes is the strategic spine of the whole mission. Without that clarity, they’d have been chasing a fairy tale while the real threat grew.