"She doesn't have a sweet voice". You could also use "She hasn't got a sweet voice", but that is less common.
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As a compliment: She has a sweet voice. Her voice is sweet. She sings sweetly.
As a criticism: She does not have a sweet voice. Her voice is not sweet. She hasn’t got a sweet voice.
“Which is appropriate no or not?” – when used with an object, “She has no voice at all.” “There is no sweetness to her voice.”