Principal Weems holds a significant grudge against Morticia Addams in Wednesday, and the reason for this stretches back to their days at school together. The animosity here made Weems (played by Gwendoline Christie) a rather suspicious figure in season 1 of the Netflix series since it seemed she had a motive for wanting to see Wednesday harmed. However, this was all meant as a red herring, and Wednesday ultimately revealed that Principal Weems was on the side of good. In truth, she cared about both Wednesday and Morticia, though the latter relationship is far more complicated.

https://screenrant.com/wednesday-principal-weems-moticia-addams-grudge-explained/