I don't think she is. I'm not aware of any indicators outside of her acting role on Homeland.(Though obviously I don't know her personally, lol!) With celebrities under such scrutiny as they are, something even resembling BP symptoms would be seen as sensationalistic and therefore exploited. They'll latch on to the least tidbit with little regard for accuracy as it is, as we sadly see every day.

I do think it's possible to portray convincingly. I think it's a matter of a few things. One is how diligently they study, and choosing appropriate sources for greatest accuracy. Also, perhaps as part of that they personally have close in their life one or more people with it. Basically, choosing authentic models and really tuning in. Then of course there's skill level. They have to be able to translate that knowledge into portrayal.

(Scripts help too of course. Can't discount that hard/impossible factor to overcome.)

I agree she does a good job with it. "My kingdom for a green pen!" Priceless.