Hello User981, it's not necessarily that she doesn't want to talk with you and if I can improvise here and suggest possible reasons why this maybe occurring even though I'm not qualified:
-when someone is suffering from any type of MI the one thing they dislike is to be asked question after question, even from a good friend, simply because they have no answer and even if they reply back to you, it may only be dismissed as not being serious
-one reason why couples sleep in separate beds is once again the same reason, not be asked question after question
-whereas if they sleep by themselves there is only peace and quiet
If she is comfortable with you being with her, that's all you need, but nothing is to be said, no questions, she will accept your trust and talk when she wants to, let her have the floor because once you start asking question after question, she will close up.
I know you want to help her.