This "lady" certainly does appear to be an invigilator, these staff tend to work a few hours only on a casual basis, while the vast majority are good, sometimes you can get embittered people who see young attractive and succcesful people on their way up and get jealous of their determination and success. Perhaps it is worth talking a Student Union at the college? or welfare officer if they have one? There is no way you should be denied the opportunity to do your best performance. Good luck in your next exams
