If she is working maybe arrange with her place of employment to suprise her with a visit. Give her a public display of affection with flowers, balloons, and maybe something funny/corny like a singing dance routine or send her a flash mob or telegram singer. Then take her to lunch or dinner from work with out her getting all dolled up and keep emphasizing how beautiful she is and makes you happy and that you are in love with her as much as the first time you met her.
Make her a bath with 2 gallons of whole milk, and some scented bath salts, candles and flower pedals spread every where.
Make her a self made edible arraignment from fruits with cookie cutters.
Maybe some sex toys, lingerie or spice it up with fullfillimg one of her secret sexual desires.
Fix all the broken shit around the house, hook her car uo with some wheels/tires, sound system or full detaile lol
Spa day or massage parlor where she gets a happy ending �� ahahahah
Proclaim your love in public somehow like sky writing, sports game, video on youtube or w.e.
Im running dry. But the 1st idea was the best one.