Theory N1:

In security breach, chica can be seen eating rotting food off the ground, attacking the pizza bot and even chomping Gregory when she catches him. I think the reason she does this is because she was programmed that way. Think about it! And this isn’t the only example of her being programmed as a cleaning bot. In her fnaf 1 cut stage performance, she literally says “But keep an eye on your pizza, Cuz I’m a bird who likes to eat! Nomnomnomnom!” and she is heard in the kitchen probably looking for food! And then, in Itp the game, we receive blueprints for chica from Gabriel, and they say “don’t eat around chica.” And “ she is burrowing trash in the vents as a nest.” It is all connected!!!

Theory N2:

Im delusional and she is just broken.