I think the privacy arrangements around minor royals who are still in full time education will continue until she graduates. 21st birthday (a traditional landmark event) has been used as an exceptional occasion.
The Edinburghs have been good at keeping their DC out of the press (except when attending royal formal and family occasions). The press may or may not have known about the garden centre job whilst she was still doing it, but there was no reporting about it until after its conclusion (and the announcement that she was off to university). That is, I think, a good thing.
Yes, Sophie and the Fake Sheikh (deliberate sting by News of the World reporter Mahzer Mahmood) was huge news at the time in the 1990s, and she was absolutely pilloried in the press for ages - unfit to be a member of the royal family, national disgrace etc.
Their "half in, half out" ended with that, and they opted for "in"
In the three decades that followed, they've carried out royal duties in unexceptional fashion. They've not tried to spin their way out of it - they've changed the substance. And the plaudits the Duchess now receives, particularly for her work against VAWG, FGM and rape as a tool of war, are thoroughly deserved. They rarely make the headlines though, which is unfortunate.
But that was