The 'Probable Answers' for Sentence Transformation indicates that the exclamatory form is 'What a diligent student Elora is!'.
Class 6 › English Grammar and Composition › Chapter 11: Answer Key, Sample Question and Guidelines › Topic: Grammar Section (Parts of Speech, Gap Filling, Sentence Making, Verb Forms, Sentence Transformation, Punctuation)
Aligned to the NCTB national curriculum.