Can the Pearl Blue flight attendant of China Southern Airlines be sick and postpone the physical examination?

Of course. According to "China Civil Aviation Personnel Medical Examination Standards and Medical Examination Certificate Management Rules", if there are special circumstances, you can apply for an extension, but only part of the medical examination items will be postponed. For example, some women just meet the physiological period when they take part in the on-the-job physical examination, and the relevant physical examination items can apply for extension.