Your register is good, but the laughs feel forced. Because there's no energy in the lines and the laughing feels uncomfortable, they sound less like laughs and more like hiccups. Don't be afraid to have more fun with her lines. She's in control of the room and is having fun tormenting those beneath her. She wouldn't sound like she's too tired to bother.
Understood! I was struggling with the laughs, but I try to make them sound more natural.