I definitely wouldn't contact her if you aren't going to mention the anniversary.
I can see in some situations sending a blank card with the note, "I'm grateful for the good times we shared." Nothing that seems pursuing or implies you have a romantic or marital relationship in the present.
I'm not up on your situation enough to know if that would be a good idea in your case.
If a note like that isn't a good idea, I wouldn't contact her at all this week or next.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16