Your appetizer should be something simple she can enjoy while you get the main course ready. A platter of nice cheeses, crackers, and grapes and apples is simple but should be fine. Potato skins are a good option too.
The main course can be whatever you feel like. The possibilities are endless. You could butterfly a chicken breast (kind of give it a pocket so you can stuff it) and stuff it with feta cheese, spinach (defrosted frozen will work fine) sundried tomatoes, and black olives. Or, you could grill some steaks. Serve either with a salad (garden or other) and maybe a steamed veggie too.
Dessert should be something that can sit through the day so its ready before you guys even sit down to eat. Cheesecake is super, I don't know a girl who doesn't love cheesecake. And, I've seen that you can buy premade cheesecake filling now if you don't want to hassle over dessert.