I think you can mourn and still be detached. Both are healthy. I actually think detachment can bring on mourning, cause you're accepting, letting go of what once was.
I think it's great that she still comes to you for emotional help, i.e. when she's stressed and needs to talk, that is seeing you as a supportive friend. That's an excellent thing, for you both and your friendship.
It is in the shelter of each other that people live.--Irish proverb
