Facebook is kind of a weird thing. They don't want to unfriend you and you don't. it kind of opens the door to each other's life. And if they are the kind who posts their lives on FB, it lets you peak into it. I would stop tagging her in pictures. She or someone else has the option to do so if she or they want to. For me, My W's sister tags my W on my pictures and I stopped peaking on her page. Keeps me detached.
Me:28 W:24 M:4 years S5, SS5, S2 Separated: 07/01/14 Asked for D 1/09/15