<p>She is going to do what she is going to do in terms of keeping or dropping the BF.</p>
<p>If you can talk to her about it all with an attitude of sharing info so that she can make fully informed decisions she may listen to you. If you can encourage her to make sure she and her BF have plenty of time to be involved on their own campuses as well as in their own social groups that would be good. She may not act on it and may barely acknowledge it, but if you can keep it light and non-judgemental, remind her to be involved and be active on her campus and have a life other than just her BF and perhaps point out she will be a more interesting person to her BF and herself</p>