The resource guarding of the food in the laundry room needs to stop right away. It is your house and your food, not Cookie's.
The fights may continue now that they have started.
I would keep an eye on them, crate them, or Cookie, when you're not home, but definitely either move the food away from there or stop her behavior immediately. She shouldn't be doing this standing guard nonsense.
Norden von Narnia (Hans) DOB 1-15-2012