The orders given by Crown Prince Randver were for the guards guarding her room. She didn't know how, but the blonde-haired man managed to place two guards in front of her room to prevent her from escaping.
It wasn't a good thing since she really couldn't escape from the room, but after she managed to trick the Crown Prince's guards, she felt grateful that the two guards were the only ones working under the blonde man at Prince Reigen's Palace.
For some reason, Crown Prince Randver did not change the guards guarding the front of Prince Reigen's palace. The men in front of Prince Reigen's palace were the second prince's subordinates, and they would only listen to the second prince's orders, not the Crown Prince.