Did you serious think she was a threat to herself and/or others, or was you just being a dick? Teens are filled with angst, depression, and spontaneous fits of mania.. And schools take that shit very seriously.. Depending on the legitimacy of the situation, you could be helping someone too afraid or unaware to seek it for themselves, or.. aiding in the cultivation of something violent by putting the under the microscope for something that is just normal. Have to be careful in making those types of calls.