Mean girl at work

There is a coworker at my job who i noticed never liked me. Even after helping her with something that i shouldn't have, she would look away everytime I'd try to say hello. I've caught her on occasion looking to see what I'm working on in my computer. Last incident i had with her was that she purposefully cut me off as i was walking across the hallway in opposing direction as her. Any advice on how to deal with someone like this?