The effects of Kendra being off her meds is already having an impact on her. She was probably taking mood stabilizers which is why she complained (incorrectly) that she was fuzzy-minded and unable to think. What it really was is that her mood stabilizers were keeping her from having high-mood swing episodes and mania as well as severe depressive episodes and emotional breakdowns. Other than Anna we see her being short and snappy with everyone she is talking to and she is suffering from one of the most debilitating symptoms of BPD. When she is talking to herself and insisting that David could "Love Kendra" she is suffering from disassociation. This can be one of the more dangerous aspects of BPD and she is in big trouble if it is happening. She probably also was on anti-anxiety meds so as her identity continues to collapse and her mood continues to swing wildly she will start to get paranoid and distrustful. She may even start to have panic attacks and episodes of memory loss. In the next few days of Anna's story, I wouldn't be surprised if she continues to unravel and become a real mess, maybe even to the detriment of her plan. Untreated debilitating mental illness does not a mastermind make.