In addition to vitamin cottage, whole foods and sunflower market, you might check out your local farmer's market for fresh, unprocessed, local food. Many, although not certified organic, do not use pesticides or herbicides. You can ask individual stands to find out more. There is one at Aspen Grove on Wednesdays, in Highlands Ranch City Center on Sundays, and Southwest Plaza on Saturdays, as well as many more in other areas of the city. You can often get naturally raised eggs, chicken and beef, and wild salmon in addition to fresh fruits and veggies.
Good luck, I think it is great you are doing this for your daughter.