Most likely she has the usual culturally imposed anxieties. Getting past that, to the point where you can create ties of friendship and trust, where you can relax in each other's company - this is what will make or break your relationship. She brushes against me quite often, hold onto my arm, even touches my cheek affectionately. This is a good sign. At the very least, it indicates she trusts you enough to risk breaking the first physical barrier between the two of you.
Touch is meaningful.
Very likely she wants to get closer to you. Gently encourage her. You can't . Relationships are based on trust . I thought I had a good relationship with my girlfriend, but she seems to be losing interest in me.