She wants to stay longer.
stay - verb
longer - modifies "stay" ==> adverb
She wants her stay to be longer. - adjective.
Why? Does it matter? The meaning is clear.
2020년 4월 4일
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It's an adverb: it describes a duration of time.
2020년 4월 4일
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adverb ( clarifies "stay") to stay (a little) longer