very nosy friend help !!!!?

so to start things off I am very private person that i don’t share everything especially with judge mental people. so I have a friend that I have been friends for the past 15 years. I never share personal things with her because she judges me. so For years she has been blocking and un blocking me on facebook when she is mad and when she gets un mad. so when we are back friends on fb I hide my posts from her because of her jealousy and judgemental thoughts. so today I found out she unfriended me due to us having a argument so i knew she couldn’t see my posts so she sent me screenshots of posts I been making and said see i know u been hiding posts from me. I think she has been watching me from a fake page. but the issue is I added so many people I don’t know which page could be her. why is she going through all of these crazy measures to catch me writing things on fb that I choose not to share with her ? and she has nerve to try to confront about my posts that she has no permission to me seeing ???