Niki thought back to how she dealt with it in the beginning as there was only one way to keep everyone safe from her alternate personality. Niki had confessed to the murders of the people Jessica killed and was kept in a padded room for her own safety. The drugs administered there were powerful enough to keep Jessica away and if Jessica couldn’t surface then people were safe from harm. It was the only method that Niki could think of on such a short notice.
"Who else should I tell?” Niki asked, wondering if maybe the easiest way to deal with Jessica was to give up completely like before. “I tried locking myself away to make sure that she couldn’t hurt anyone. I admitted to murders and asked to be drugged. It seemed like the only way to keep her from controlling my life.”