Princess Ievna did get things she needed to make herself look more presentable. Prince Reigen left the room earlier, probably headed for the bathing pool, but then he returned to the room again with a small box in his hand.
The prince said that the box contained items most girls needed, and he even questioned the princess about her ability to apply makeup. The annoying question made the princess snort.
She had previously said that she did not care about her appearance since the prince found her in the prison tower, and she was not lying when she said that. Even if she got the chance to return to her human form during the Spring, Princess Ievna still thought she didn't need to care about her appearance since she was no longer human now.