Is a Peanut Butter Sandwich good enough?

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My kids are taking their lunch to school now instead of buying the meals there. The only thing one of my daughters wants to eat is peanut butter sandwiches. They also get fruit and a treat, but the daily peanut butter sandwiches get me wondering. Is this the best nutrition for her? She's getting more than when she bought the school lunches, which she rarely ate. (For those who are a few years away from elementary school, yes, they still serve mystery meat. And it still looks scary). Do I make her take turkey sandwiches once a week or just stick with good ole Jif?