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Since the beginning of her life that the Matriarch saw life as food. Of course, what kind of predatory organism wouldn't think that? Every single living being that predated on another would devour the other constantly, this was how life was in the planet where the Hivemind was born, and it was also how it was always has been in every planet with life.
The origin of the Hivemind was from millions of years of evolutionary history, evolving from small starfish-like ancestors that stuck themselves in their sea's bottom feeding on detritus and the occasional small creature that dwelled in the bottom of the ocean, they slowly began to branch off from their original ancestors, evolving into more and more aggressive hunters that preferred to hunt prey than to lay low.