II.ii.45-46. This shows that Lady Macbeth is aware that she committed something terrible. She is not completely without remorse. Instead, she is able to hide from her emotions by not thinking of the murder.
We must not think of the terrible act we just committed. If we dwell on it, we will go crazy.
II.ii.86-88. This shows that Lady Macbeth is remorseless. She and Duncan worked together to Kill the king and she does not feel sorry. She says they'll be fine as long as they wash their hands.
A little water will wash away the evidemce of our deed. It's so simple! You have lost your mind.
II.ii. 44-47. This shows how Lady Macbeth berates Macbeth for feeling guilt and remorse for murdering the king. She does this by attacking his masculinity, calling him cowardly and weak.
I thought you were supposed to be a man, and yet your crying over this? You are such a coward.