So, i looked at it again. It was late last night...
It's possible that she actually has a history of psych meds and psych treatment, but no meds/treatment at the present time. The sentence in eval reads "Pt denied any current Y meds or the need for Y tx (treatment) while incarcerated". The 'Y" could be indicator that evaluator covered topic/asked about history of meds/treatment or that there is history. Very odd wording... If there were previous meds/treatment Bipolar is more likely. But Bipolar can be overdiagnosed and can mimic symptoms of other disorders.
@Artis - Yes, we just don't know enough. I totally agree. Borderline is a possibility, but impossible to know for sure with what we know. And that diagnosis, even if in place, would not explain her choices... And symptoms of Bipolar and Borderline overlap and can be very difficult to tease apart. Impossible to do withing having so little information.