http://billmcdonaldonline.com/confidentiality.html

I found the above link with information from a therapist practicing in Michigan:

"
We keep a written record of treatment and conditions, this r ecord itself considered confidential in accord with the laws of the State of Michigan regulating privileged communication, except when:
- legal constraints apply
- when a compelling need arises based on substantial probability of personal harm to the client(s) or others, or in cases of a life-threatening emergency,
- when an insurance carrier asks to review the records to verify the services billed to it have been rendered, and/or
- when the client has signed an appropriate form for the release of information"

Looks like the key part pertaining to you is what I bolded. If your T is calling your SI "."substantial probability of personal harm to the client(s)", then she looks to be within the law.

Sounds like you need to have this discussion with your T though.