The thing that can be inferred about Lady Macbeth's state of mind from this scene she has a guilty conscience and is slowly losing her mind.
This refers to the deduction that is made about something, based on available evidence.
Hence, we can see that from the complete text, Lady Macbeth is sleepwalking and washing off imaginary blood from her mind and we can infer that she has a guilty conscience and is slowly losing her mind.
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