Something to do with her business plans. She'll magically have just the contacts and knowledge Robert needs to make Aaron's birthday extra special because plot has dictated it to be to make Aaron paranoid. Also because Aaron will see a nicer side to her tomorrow and let bygones be bygones so he can be jealous and insecure in secret.
The real question is WTF has happened to ruthless Robert who wouldn't let anyone blackmail him and try and split up his relationship?