Maybe try listing what options you have. From what I can tell, you can: - ignore it, focus on you - ignore it, focus on you, change friendship with her to "coworkers" to parent - tell her that you aren't telling her not to, and you understand her choice, but that it hurts to see her with others, then focus on yourself ... maybe a virtual note to her that you don't send, might help instead - etc...
Once you see what options you have, choose one and move on.
