Other people posting pics of your kids without your permission??

My fiancé’s brothers girlfriend treats me like trash every time I see her, and always makes every situation about herself and always plays victim. She has been nothing but nasty to me and has been a huge source of anxiety for the last two years of my life.

She sees us about once a week (not my decision) and she posts pictures of my son all over her social media without my permission or my fiancé’s. Not to mention she makes it seem like my son is her son. I have mentioned to her before I’m uncomfortable with her nonstop posting pictures of my son but she hasn’t stopped posting. It really bothers me that she still does this even after me asking her to at least ask permission before posting. Am I right to be uncomfortable? Am I over reacting?