She's tried, but it's hard. The Laughing Man cracked her conception of reality, but he at least didn't attempt to remold her like Huir did when he brainwashed my daughter into being his own. The Laughing Man tried once to make her the Harlequin, his henchwoman, but that was the one time she beat him and ran out, half-naked and bleeding badly.

He developed an obsession with her instead of the Second Batman because he noticed Raven never laughed. So he had her laughing all right...and Susan never psychologically recovered from it. It's how she went from Raven to Dagger as a result of it. It's like how Revcel went from Troubled and Quiet to Quiet and Psychologically wrecked.

H'vorxixnon H'ven Soroundon.