To me she just looks unconfortable because she seens to be really concentrated on understanding the questions, answering them correctly and with proper english without saying anything compromising. It's also funny how japanese her facial expressions and body language are while speaking english, it has a really weird result.
She seens to have to stop from times to times in order to find the right word on the back of her mind. And obviously she is trying to do all of that while looking good, considering looking good is a huge part of her job as a popstar.
She is just struggling through a language she still is learning while trying to look cute. If this alone makes people see her on a bad light over this forum, I guess this just speak a lot about the kind of people we found around here.