As the laws of physics begin to disintegrate, Stace slips into the place where all these chips are coming from: the chip dimension. It's just all chips, all being fried, all being picked up from greasy cardboard or newspaper or paper plates or rotting dustbins or back pockets or the wind or from within chips themselves.
Stace attempts to get stuck in, but her presence does not follow the logic of the chip dimension, so she herself becomes a chip. This is a relief, because it was getting kind of horrifying, and Stace eats chips for light pleasure, not existentialism.