Hermione's role in that final fight often gets boiled down to 'she helped with the basilisk fang' or 'she cast some protective charms,' but that feels like a massive simplification. The entire Horcrux hunt was her design from the start—she was the one who packed the beaded bag with every conceivable necessity, who had actually read 'The Tales of Beedle the Bard,' and whose quiet, stubborn preparation kept them alive long enough to even reach that point. In the Room of Requirement during the battle, her efficiency was terrifying and beautiful. While Harry was focused on the diadem and Ron was dealing with Crabbe’s fiendfyre, Hermione was methodically clearing a path, shielding students, and solving problems that hadn’t even fully presented themselves yet. She didn’t get a flashy one-on-one duel with a Death Eater; her battlefield was logistical, intellectual, and utterly foundational. Without her, the entire resistance effort in the castle would have collapsed into chaos within minutes. Her role wasn't about a single killing blow; it was about making sure the entire, fragile structure of their plan didn't fall apart under the weight of the violence.
And I think the most telling moment for her character is after Bellatrix is dead, when the trio is walking through the devastated Great Hall. Hermione isn't celebrating; she's already moving among the wounded, trying to help, her expression grim. The battle ends, and for her, the work simply changes shape.