Perhaps your T is worried that it will have gone too far? I think when it comes to the line of safety and confidentiality it is a hard position for a T. My own has told me a few times that she was on the border of contacting someone. I think that if your T has not seen the scars that it does seem that she is reacting quickly - buuut if the tool is one that could cause serious harm or you have an extensive history of hospitalizations due to self harm then I can understand her concern. I think she is in a tough position, but I think that if she is going to "tell on you" without discussing with you honestly and in good detail (understanding both your own intentions and her concerns) then I can understand why you would lose faith/the ability to trust and speak openly with her.