They see her sleepwalking, and acting out her guilt. Lady Macbeth gets up, goes to the closet, reads a note, writes, and goes back to bed. She also "washes" her hands- trying to remove the blood that has stained them.
The doctor tells the woman that he cannot help her, that she needs help from God. He realizes she has a guilty conscience. The doctor goes to tell Macbeth.
she is trying to get blood off of her hand so they tell macbeth and they both get caught