The texts and invites and pictures may be her way of feeling good about herself, that she's not cutting you out. It may be her way of feeling less bad about the D. Who knows?
My W will text me the strangest things sometimes. Stuff about her family that I could care less about now. I always appreciate pictures of our kids. You are co-parents, you will always be connected in that way.
Who knows what is in your future? If your W really wants you back, it will be obvious and you will know. Otherwise, you will be confused periodically.