Defamation

Dear Levelset, I am a high school career and technical education teacher. I teach students about Entrepreneurship. About a year and ago, my students and I created a non-profit called "The Center for Entrepreneurial Studies". It turned out to be something the community rallied around and appears that it may actually become a major thing. My boss never had time for me or time to digest the project. I mentioned it to her repeatedly but she seems to think I did it without her knowledge. Nevertheless, the Superintendent loves the idea and mentioned an MOU, etc. etc. I knew my boss was still not on board because she refused to answer my messages or requests. Recently, the woman who previously held my bosses position saw my boss in the grocery store. During their conversation, the previous administrator exclaimed how excited she was about the project. My boss stated that I signed contracts without her consent and I was trying to get her fired, which is untrue on both accounts. I know my boss has repeatedly "poisoned the pool" and I have never had concrete proof. How should I proceed in your opinion? Thank you