YA (Possibly) Female Protagonist experiences weird event at a school?

[Brini]

The Female protagonist goes to some sort of school. I remember her going to some sort of Photography class and feels as though she is being stalked. Near the end of the book she finds some sort of "secret/hidden" room. She finds out some very important information about something, she is then confronted by the antagonist, an older guy, in the woods? I remember that the she ends up ok in the end and everything turns out alright. I read this book in Highschool, so around 2016/2017. I'm guessing the book is at least around 2017 or earlier. I can't really remember if the book was YA or a Fiction. Any help is appreciated!

[Lobstergirl, au gratin]

Please specify what the weird event is in your topic header. Always be as specific as possible in your topic header/title rather than vague. It helps searchers.