This ugly ginger girl at school fancies me how do I get her OFF me?

There's this girl at my school in yr 11 (I'm in yr 10) who fancies me. Before, she'd tryed to get to know me, like sitting at my table and stuff and asking what I liked and my interests and stuff. I'd just ignore her or just reply with ''yes'' or ''no'' and look away and treat her as if she wasn't there so she'd leave. She's ALWAYS staring at me. After the half term holidays she asked me how valentine's was I said it was OK and she said it was just another day for her. Then later that day she looked at me and I caught her staring but she smiled before she looked away. I happened to of been sitting alone during break and she walked up to me and asked what was wrong. She's like intruding my space and plus she's ginger the other week I called her a horrible stupid ginger ***** behind her back and she knew I was saying those things about her then she ran off crying and told her friends. She's ugly as hell she has like this curly ginger pastshoulder length hair (carrot top lmaooo) and thick black gles pale skin that looks gross and freckles she always wears the same uniform over and over at my school (I called her a tramp lol) wearing a uniform is optional but 95% of the school doesn't so it looks awkward. She doesn't even talk about girl stuff (or even LOOK like a girl for that matter) she'll be talking about like sports or computers and stuff instead. She's just repulsive and hangs with the outcasts who have no friends. Whenever she's in the same room I'll walk out to avoid her. A couple weeks ago I met my girlfriend in yr 9 (she's a prep but she. is. GORGEOUS.) we broke up but we're back together now. I actually wanted to get this autistic kid to date her then dump her for the heck of it lmao. But I got her to try get it in her face that we're together and she's a loser. But she still tries to sit next to me and still looks at me. How can I get rid of the stalking ***** ?