I assume she is talking about the Covid protocol, where the attending royals attend alone and not (as in earlier games) with their spouses.
Similar to the Japanese Emporer attending the opening ceremony without his wife (and I think I read somewhere P.Akishino will attend the closing ceremony, again without wife).
This is in line with the guidlines regarding no public and as few people as possible at the Olympics (royals who used to attend in a non official function, just to cheer on their compatriots have stayed away this time) and sportspeople having to fly home after their events are over (in normal Olympics they would often stay and enjoy the atmosphere, the olympic village and the other events and cheer on their teammates).