Having Snacks

Today my daughter came out of school in a much better mood than usual. I found out that they had done cooking in the afternoon and because they made sweets that she couldn't eat they gave her a banana instead. It seems that the extra snack made a huge difference to her later. I am wondering whether the school would be willing to let her have an afternoon snack every day, or whether she might be embarressed at being the only one in the class having something. Hasanyone else asked schools to do this for children?