Possible Public Sector Interview Questions - please help

Hi all, a friend who was made redundant in her public sector role last month has now got an interview with one of the big government agencies soon. Unfortunately she's really freaking out as she gets especially nervous in interviews when she's thrown a question she hasn't prepared for, and then blanks and tailspins. It's not an especially senior role but I was wondering if anyone in the public sector has been in an interview lately and what sorts of "curveball" questions they might ask, so that she's a bit more prepared. Or just some general advice I can relay to her. Many thanks in advance!