I HATE MY COWORKER

So currently I am beefing with a grown ass woman. Wonderful I know. I just hate her so much. Everything she does makes my skin crawl. Every time she walks by me she feels the need to hug me or put her hand on my lower back or touch my arm. Me personally, I don't see the need. It's ridiculous. 

She's complained about me to my boss too for 'yelling' at her - I sternly told her to not do something, that is not yelling is she stupid? 

Anyways I want her to stop touching me but I don't really know how. I don't really want to go up to my boss and complain because it would make me look rather pathetic and I don't think he would care. If I told her, I think it would just cause drama too. I feel so stuck with it and I can't stand her touch because I'm not a very touchy person.