Living in constant fear of losing control of herself and being fully assimilated into the Solver like Cyn and being used to finish destroying Copper 9 and everyone she loves.
The Solver tormenting her with visions of its crimes such as the horrific process it used to corrupt N and V into Murder Drones, it's gruesome murder of Tessa, the destruction of the Earth, the slaughter of the Worker Drones in its first attack on Copper 9 (including her mother's body being killed), Doll's murder, etc.
The Solver trying to put bows on her all the time to make her look more like Cyn and Tessa all the while insisting that she would become her new host eventually.
The Solver preying on her insecurities from being a social outcast to make her feel like she isn't good enough for N or anyone else to make her more isolated.
The Solver making her hallucinate seeing her reflection turn into Cyn, or worse herself wearing Tessa's skin the way Cyn did.
(Edited by LordJarman)