Maybe this can work to chip away at the wall, maybe she'll get angry and throw it back in your face, who knows. They sell entire printed coupon books for lovers at drugstore or bookstores - includes coupons for things like a car wash, massage, night on the town, breakfast in bed, etc. What I've found useful is to shop carefully for something personal they said they really "needed" (make that "wanted") - I do this with my D12 now with very good results. - she wanted a good quality sweatshirt with the logo of our local university and I could see how happy she was to get it.
