Point #1: This is an unknown United States High School of an unknown State. Rules and regulations vary between states and public and private high schools.
Point #2: You (student) own the physical property consisting of the binder, the paper, the ink you wrote with, the tabs, etc. You also own the derivative intellectual property of both the notes from her class and any other class you took notes in that happen to be in that binder. You also own the the absolute intellectual property of any doodles, poetry, and notes you took on subjects not related to the classes you took (ie. "I love Sarah", "My economics teacher is a moron"). If the binder in question was a zipper binder like I use, you also own the pens, the disks, the Scantrons, the gum wrappers, etc contained within.
Point #4, Followup: If this teacher is somehow still teaching next semester, form a student club (or just a bunch of trustworthy dudes/gals who are skilled at taking notes), and scan their notes. Post to a blog or the Pirate Bay.
Point #5:For further ideas, read Cory Doctorow's Little Brother, or just about any blog or article on privacy rights. Hell, read the constitution.