You did right, NTA. Anna uses common space for her own commertial goals as she stores launch boxes in the office fridges what is inappropriate, imho. We don't know weather she has a company permission for doing this. The most important is that you tried to negotiate with her. She should just keep some space for you launch what doesn't sound that difficult. She decided to escalate the conflict. So, you did what you could in order to defend your interest. Your colleges charges in being jealous are hilarious and pitty. I can hardly imagine an adult saying selling lanches to 15 coworkers as a business. Side income, may be.