Keep doing what you're doing for a little while longer... if she is still around, then you can simply ask her if she likes you.
Women usually won't waste their time on a guy they don't like.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen