Lady Macbeth is a powerful figure, capable of influencing her husband and of considering great violence. She is potent. She is cruel.
Ultimately, she also takes responsibility for her actions. Though she is bold enough to go through with the murders - or help her husband go through with it - she is not emotionally strong enough to stand up to the guilt of the aftermath.
In all these qualities, Daisy is opposite of Lady Macbeth. Daisy does not have any influence over the actions or decisions of Tom or Gatsby. She is not bold enough to go through with her affair with Gatsby and to leave Tom.
In her flight from this conflict, she accidentally kills someone and does not take any responsibility for the act. She is not cruel or ruthless, but merely petty and bitter. She is disappointed but she is not power-hungry or truly ambitious.
Daisy, like Gatsby, is something of a dreamer where Lady Macbeth is a "schemer", full of politics and rationales for bad behavior.