Due to my accommodation letter i have preferential seating. However in one of my classes despite the professor explaining to one girl who keeps seating in the front seat i need, she still sits there. I get there early but she still gets to the seat before me. I've tried to be polite but she won't listen. She's been also super smug about getting the seat. When i do get she'll be super rude to me. Also she just texts and what not when she sits there. What's the next step? A friend suggested the disability department.