Who were you attempting to shame? People who actually do experience trauma? Or people who use the word lightly? Because doing the latter in the way you elected to, is pretty counterproductive in my opinion. Satire is the use of humor, irony, exaggeration, and/or ridicule, with the intent to shame, ridicule, and/or criticize. Since this thread has become a minor vocabulary lesson, I just thought I would contribute.
Furthermore, using overdramatic vocabulary for minuscule problems (i.e. trauma, triggered, etc.) can actually be supremely disrespectful, depending on the word. But that's a topic for another day.
But to answer your question, a hard no on the underground copy thing. That is illegal, and again, supremely disrespectful to Mr. Richmond and Ms. Benjamin. And to the expected release date, there are a few songs from Mean Girls on musicnotes.com, so I would keep checking there periodically.
And in closing, keep in mind that you are posting on a forum that has multiple people who speak "smartass" quite fluently, and often respond with snark to make a point. That, in fact, can be considered a form of satire, depending on the situation. And also, when you post on a forum of any type, you won't always get the kind of response you want. It's just part of being on a message board.
I hope you're able to obtain the sheet music! And in a legal, diplomatic, and respectful manner :)
(TL; DR The information you're looking for is in the third paragraph. But you are free and encouraged to read the other paragraphs, as there is some useful general information in those as well.)