Not really wanting to get into an argument but in this particular case she went from speaking perfect english with no accent to speaking broken english in a portugeuse accent. That doesn't just happen. You don't just lose the ability to speak your native tongue out of the blue. It's a conscious decision and just comes across as very odd to me.
Not really.
English is not my first language however.
But I switch accent depending on occasion to the point that Brazilian students think I am Brazilian.