How did lady Macbeth respond to Macbeths vision he had at the banquet?

When Macbeth has a vision of Banquo's ghost at the banquet, Lady Macbeth tries to calm him down and dismiss his hallucinations. She tells him to be composed, and that his guests will think he's insane if he acts strangely. She also tries to convince him that the ghost is just a product of his imagination, saying it's "nothing but the coinage of your brain".