Lexapro is an anti-depressant - if she is Bipolar, this cannot be taken without a mood stabiliser, as it is likely to push her into mania.

Not sure what MDD is, sorry I cannot help there.

She just needs to be very careful with her meds and watch her moods, and hopefully when she goes back in 2 weeks, the pdoc will have a better overview.

Did you go with her to the evaluation? Are you sure she would have mentioned the previous dx of bipolar? Would she have mentioned the mania episodes?