Reiger's return, apart from Yuri and Marilyn, wasn't known to anyone else.
"How am I supposed to explain this situation?"
With this sentence as a summary and reason, Yuri chose to temporarily conceal the news of Reiger's return.
If it became known that Reiger could magically move such great distances at will, the nobles within the capital would surely act like sharks that have caught the scent of blood. The royal family might even entertain some thoughts that they shouldn't, concerned with this, Yuri decided to keep the news of Reiger's return under wraps so that not even Mistis, Isu, Ai En, and Ian were aware of it.
Reiger did, in fact, want to tell Yuri that she was making an unnecessary fuss.