Don't do anything in terms of a gift or really even a card. Don't give her anything physical. Pour her a cup of coffee in the morning (if she drinks it or tea if that's her thing). Say "happy anniversary. Wish it was under better circumstances" and get your but to work. Just a thought. No flowers, etc.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt