It's not your place to determine what she does or doesn't say about it. They're in a relationship. She has to put his interests and the relationship's interests ahead of what's most convenient for you. You'd only be betraying the friendship again if you try to make her allegiance be to you. Let her figure out for herself what needs to be done.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy