The fact that the emperor doesn't use her name from before they moved into the palace, is a subtle sign that he no longer seees her as the girl he fell in love with. The other fact that he no longer values her as he once did, is that he didn't keep pursuing who the real murderer was, but let the matter drop at the Dowager Empress' suggestion/order. He could have investigated the matter in secret, but didn't. He has begun valuing his image above all else. He also lies to her here. He said he would escort her out of the cold palace. Instead he sent Li Lu to do so.
A'Ruo is discovering that no one trusts a traitor. Everyone knows her for what she is. All the acting on her part, can't change that. Her lack of self awareness could be pitiful, but her evil heart keeps people from pitying her. In the end she reaped what she had sown.
