In general you can travel in and out of Europe (as a resident) by showing a documentation of vaccination or a clean test. I would guess she did a test in Egypt

In general you can travel in and out of Europe (as a resident) by showing a documentation of vaccination or a clean test. I would guess she did a test in Egypt on return that was negative. The first case in HK only showed up on fourth PCR test on a fully vaccinated individual in mandatory quarantine.