Love the idea of a "grazing tray," that kids can help themselves to all day (with a variety of healthy fruits, veggies, etc.) I would leave it inn the fridge & she could help herself when she feels like a snack. I have yet to try this, but grazing throughout the day is so much healthier than large meals & designated snack times.
BEST Kids Product of 2011. Twinkle Curtain - DAYDREAM. Toddler daytime nap curtain/ grommeted. Size: 36"x72". $49.00, via Etsy.