Should I send this letter, and if so, when?

A good friend of mine lost her husband this week. I went to the service yesterday and seeing all of the old friends and relatives that I hadn’t seen in a long time brought back a lot of memories. So when I got home, I wrote down all the memories I had of her and her husband and what they mean to me. Should I send this to her or would it just make her more sad? If so, should I send it now or wait for a few weeks?