If Someone Signs Me Out Of School, Am I Legally Required To Go With Them?

This may be the wrong thread for this, and sorry if it is but it was the first one I saw. For context, for the past 3ish years I've been living with my grandparents. Recently my mom convinced the courts to force me into required reunions with her every week even though im already 17, and since it's america the fine print is ridiculous. If she somehow gets me to her house she can legally keep me there without ever letting me go back to my grandparents. Something worth noting is that my mom is kinda insane, and has been know to do things like slash people's screens or even put trackers on cars. I am not living with her because 3 years ago she physically attacked me. My problem now is she has become aware that my grandparents are going to be out of town for a small amount of time, and there's a chance she might show up to my school to sign me out. If she does there's not really anything my school can do to stop her, so if she does can I just not go? I don't want to hide in someone else's class and accidentally get that teacher fired, so any help would be appreciated