Can I stop her from being food aggressive/chewing EVERYTHING?

try using a muzzle, which can be found at pet stores. my dog is also crazy like that and will eat everything! we found plastic in his poop for crying out loud. anyways, whenever he starts chewing something that's not supposed to be chewed we put the muzzle on him and he jus sits there depressed. he learns his lesson cuz he feels the time out part. and now whenever he goes for something we show him the muzzle and he gets scared and backs away. this is a way to train the dog without harming him. but make sure to tell him "no" so he understands it's wrong