How to Control Your Shepherd Pit Mix

I have a three-year-old shepherd pit mix. The problem is she's severely reactive in the apartment building elevator It stems from reactive corgi charging in and muzzle punching a foster. She was then the elevator Slows goldie will begin to fixate um double her work level on a collar working levels for so the neighbors are Ignorant and let their dogs rush in before the dogs are open. I would be using just like a slip leash or martin gale And I'd be doing body blocking when that door is open.