There was a Lady Macbeth historically, but we know nothing of her personality. Her character was entirely created by the genius of William Shakespeare. He didn't base it on anything.
Macbeth does not reveal his plan to kill Banquo and Fleance (Banquo's son) to Lady Macbeth.
what the hell ? ?
a book
blood.
Banquo
She fainted
Lady Macbeth has an understanding that her husband has no manhood and is a cowered. Thinking her husband is a cowered is what helps convince her that the murder plot should be carried out.
She questions his manhood. See especially in Act 1 Scene 7. It is a sore spot with Macbeth and she knows it. "If thou durst do it, then thou wert a man"
She causes it. He would never have murdered Duncan if she hadn't pushed him to it.
Duncan shows his affection for the Macbeths by giving them gifts. In particular he gives Lady M a jewel.
Maxine! She is drawn by a man and her character is loosely based on his aunt.
Lady Macbeth isn't anxious to have Duncan at Dunsinane. Dunsinane is the palatial residence where the Macbeths live after they are crowned King and Queen of the Scots. King Duncan is killed at the previous residence of the Macbeths, at Inverness. And the murder of the King is exactly why the Lady seeks, and then delights in, his presence in her home [Act 2 Scenes 5-7].