I guess it depends on how bad you hurt yourself. if theyre superficial and she has any sense, she wont do anything but talk to you about it.

if theyre deep, and you show her, and she can see that you need stitches, she could lose her license for not calling the police to say that you are unsafe and need treatment. that will result in a 3 day hold,

alternatively, you can go to ER yourself, be very clear that you are not suicidal, you were just cutting to release stress. they are pretty likely to stitch you up and send you home, but they PROBABLY will want to release you to a family member or friend willing to keep an eye on you for the next 24 hours. if you dont have that they may keep you.

and they may keep you anyway if theyre just assholes who dont understand SI, as sometimes is the case (unfortunately).