Just tell her that you two like each other. It's how it works with women. They are so submissive that you got to inform them that you are dating. Many wont even question that, all they need is a leader. You can spank em, humiliate them, disrespect them and they will stay if you keep repeating to them that you love them once in a while. Almost all women are the same, so I suggest you just inform her and be a leader.