She provided a comprehensive and original concept of the early medieval development of the Croatian lands in the book History of the Croats in the Early Middle Ages (1971), while she collected her writings about numerous problems of the later period in the book History of the Croats in the High Middle Ages (1976).
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Relying partly on the contributions of earlier historians, she analyzed the entire Croatian diplomatic material of the Early Middle Ages (Diplomatic Analysis of the Documents from the Age of Croatian Rulers of Croat Descent, 1965, 1966–67), questioning its authenticity.
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She described the role of specific nobles in the books The Last Dukes of Celje in the Lands of the Crown of St. Stephen (1982) and Medvedgrad and its Masters (1987).
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In 1946 Klaić got her Ph.D. with the thesis Political and Social Organization of Slavonia under the Árpád dynasty.
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