I don’t know if she could control it. But she also never tried to. Regardless, she totally knew that they were trapped and she didn’t care.

However, she was in denial about herself being good. She thought the trapped people were happy. Hence she also didn’t murder. That delusion broke at the end of WV. People just assumed she would go good rather than going further off the deep-end. But with the Darkhold there was only one direction to go.