It is not what she feels or thinks. You should really try to honor her choices there, regardless of how you feel things could be different.
Me- Not really sure what you mean here?
I don't speak for Mach, but I know what he is saying HERE.
Validate her. Let her know that you accept her choice in figuring out her life. Even if you think it's F'd up. You can't change what she feels. You can't change what she thinks. You are NOT her brain. All you can do is focus on you and be somebody who is in control of the outcome for yourself.
Does that mean YOU accept her choices? NO. YOU have control over your life just as much as she does her own. Detaching means you do NOT base your future on somebody that isn't with you right now. Her choices, your life.