Co workers are nasty mean and ill mannered.?

Well long story short my colleague is female (ugly conceited and jealous). She constantly stares at me and says mean things to me. At first i laughed it off but lately its gotten worse. Its highly offensive and I wanna not to be interactive with her. But she doesnt seem to get it. I dont know why the whole point of her staring at me is. I hate her. She keeps touching my hair commenting abt my haircut and style. I think she is obsessed with me but jealous.I dont know how to insult back like the way she speaks basically I dont respond well to insults I give in. I just dont know how to get out of this sticky situation. Pls help