Rosemund stepped aside to give plenty of room in case the prince fell upon getting off the throne. (Which was to her just a very fancy chair.) While she knew, of course, where his quarters were, she thought it more appropriate that he should lead the way and she should tag along in case he had a case of the drunken headspinning. 

So with a small curtsy she gestured for Aire to go ahead of her. "I shall be right behind you, Your Highness."