She had asked Oda and Zhi to leave her after arriving in front of the prince's room. The two maids were hesitant to leave her alone, but she still forced the maids to leave the place.
If Prince Reigen did forbid anyone from coming to his room, then she shouldn't risk the maid's safety. The maids had risked their lives when they finally agreed to escort her to the prince's bedroom, and she couldn't have put the maids in greater danger.
So, she was alone as she stood before the door of the prince's room. The prince's room was quite far from the one she was in, and maybe that was why she hadn't seen the prince in the past few days during her stay in Breviel.
She didn't know if the prince had deliberately chosen a room for her that was far from his own room so they wouldn't have to meet every day or not, but the possibility did make sense. After all, Prince Reigen didn't want to stay close to her.