If she's under 17, you can hotline for educational neglect. If you go this route, provide as many details as possible that would encourage them to take the case (food insecurity, neglectful parents, etc). Be prepared for them to reject the hotline online, though, because it only allows you to type so much (and they only take hotlines online at this point); however, you can call and give more info and they'll probably take it then. DFS will do a home visit and give parents a date to either enroll her or fill out homeschool paperwork. Living in a motel means she is considered homeless, and any public district must allow her to enroll.