Tā bú shì kōngxiǎngjiā, měi gè jìhuà dōu yǒu jùtǐ de zhíxíng fāng'àn.
She's not an impractical dreamer — every plan has a concrete implementation.
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空想家 has a mildly negative connotation, suggesting someone whose ideas are unrealistic or disconnected from reality. It differs from 梦想家 (dreamer), which can be positive, and 思想家 (thinker), which is neutral or positive.