Tā yǒudiǎn shénjīngzhì, zǒngshì dānxīn zhè dānxīn nà.
She's a bit neurotic, always worrying about this and that.
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神经质 describes a personality trait (neuroticism). Don't confuse it with 神经病, which literally means 'nerve disease' but is commonly used as an insult meaning 'crazy person.'