Try a salad with smoked trout or lox or cooked shrimp/crab, or shrimp ceviche as an appetizer. For the main course, consider fish as it has already been suggested. Chicken would work too if it hasn't driven you insane already. Steak would frankly be more than healthy assuming your chick likes it and you're not 2 weeks away from a show.
Easy on the sides though. Obviously no mac-n-cheese! Maybe some grilled veggies or mushrooms? As for dessert, I normally make the chick bake me cookies or something. Not very healthy, but fun, tasty and interactive! If you want a tasty edible dessert that's yummy too, good luck finding anything clean!
If you are willing to spend the $ to go out and have the courage to consume raw fish, consider a sushi place, which chicks tend to dig. She'll probably just order rolls, but you'll need to stick to the raw sashimi for the meal to stay clean.