The little girl wants to dress up as Princess Elsa.
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埃尔莎 transliterates the name Elsa, best known to a generation of children as Disney's ice-powered queen of Arendelle in 《冰雪奇缘》 (Frozen, 2013). 埃-尔-莎 approximates El-r-sa, with 莎 commonly used for the "-sa" ending in women's names.