I don't think a binding spell is such a good idea. It would be better to put a spell around yourself so that her influence is reduced but not entirely removed. Imagine her volume being turned down. So some kind of glamor spell that renders you less noticeable to your mom. Or maybe a distraction spell. I haven't got any examples to hand, but I'm sure you could find what you needed.
As an alternative, it might be a good idea to get a third party involved - your school counselor or someone like that who can intervene and mediate.