Everything can save you at this point. Maybe she can save you, or at least support you while you save yourself. Your SI sounds very painful, big big hugs if you want them.
But at least it was on your thigh... You might not be referred to the unit at this stage because it wasn't on your wrist/neck etc...I don't know how she will assess the risk.
But I really really think you should tell her, maybe even show her of you can. She might as well know what she's up against and you need to be honest to get the help you need.
I know it's scary. I'm so sorry you are going through this. But if you think you like your new t, and that you might get some work done together, lay your cards on the table I reckon.
Xxxxx