Sounds good Grasshopper. And, you got the card we both predicted :-)
So, when she gets home give her a hug, and then before anything else, thank her for recognizing you as a valuable human being in her life and as one that experiences pain, and then validate her warmly and sincerely.
BTW, I think it was important for her to do this TODAY because of the particular importance of the date for the two of you -- it forced her to self-examination and action. So, though she says it is just a day, given her attention and struggle with the day otherwise, I'd say she experiences the significance of it as much as you.