Answer:
Lady Macbeth is reading a letter from Macbeth. She finds out that the witches made a prophecy that he will be King. She also finds out that King Duncan is coming to the castle. She is figuring out how to ensure that King Duncan will not longer be alive and how to make this happen so Macbeth can be KING. She wants to take care of this all herself.
Step-by-step explanation:
Reading of Macbeth