Best present I ever received was a card offering me my "dream trip." I could go alone or with him, wherever I wanted. I took him and our son to Italy for 16 days, stayed at 4 & 5 star hotels all the way. It wouldn't have been a dream trip without my boys.
Also liked the ten days on the island of St. John for our 10th anniversary.
Can you tell I like travel?
My husband says the best gift I ever gave him was engraving our wedding anniversary date inside his wedding band. (Had to talk him into giving it to me for a week.)
You could take her on a "mystery date." Blindfold her and take her to the jewelers. Go there earlier yourself and ask the jeweler to help you select three special pieces in your price range: a ring, a bracelet, and a necklace or pendant. Then when you get there, have the jeweler bring them out for her to choose her favorite.
Okay, I will stop now. Others should have a turn...