It wasn't that she was afraid of being alone. She liked being able to walk around the city in the quiet of night, when cars passed only rarely and the urban noise settled down into almost nothing. What she feared was losing access to the awesome cathedral-space of the Negaverse. Not what lay on the other side of the Hall of Shadows, oh no. But the crystalline caverns, where everything was quiet and no one could find her if she needed to hide. She did sometimes, when things became too much. Bolton would acclimate, but for now... for now she had her little corner in the rat's warren beneath the earth. She would hold onto it with everything she had.
Her aura-sense was unrefined, easily confused or confounded. So when she rounded a corner to see a senshi, she was surprised, but not entirely put out. She knew her duty with regards to senshi that didn't have that same darkness in their aura as she did, and it was attempt to destroy.
Zircon said so. That's how it would be.
Saint Sergio