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She looks cute with her hair cut short.
Literal
She [topic-は] hair [object-を] short-make and cute looks.
短くする ('make short') is the productive 'i-adjective + する' pattern for causing a state. Linked by te-form to かわいく見える, the sentence describes the result of cutting hair short: 'with her hair short, she looks cute.' Note the chain of i-adjective adverbials: 短く...かわいく.