Nothing is more valuable than love and appreciation for the one who showers love on everyone except herself in my opinion and these kind of things dont require any special day. But if you still ask, women kind of expect special treatment specially when it comes to anniversaries. Buy her Flowers that she loves, along with some chocloates, know what she loves and what she doesnt by observing it everyday. You can even take her on a last minute date to her favourite place or be her helping hand at cooking. Best Wishes in Advance.