I'd say that is one of the other hallmarks of the "disorder" which is "high risk behavior." By excluding your therapist from complete awareness of your situation you could simply be utilizing therapy to "self-soothe" other symptoms without making her aware of the full range of your behavior.

She may be of the opinion you have an entirely different type of challenge and be treating, say for example, you for depression or some other thing. By not fully informing her you keep her in the dark about some fundamental behavior that arguably SHOULD be the "focus of clinical attention" before all others because it can wind up with you unintentionally dead.

If you want help then you have to trust the people responsible for helping you with as much information as possible. Keeping your therapist in the dark won't help them help you.