How can I tell if she is playing games

You obviously have a thought that she may be as you are asking this question. Always listen to your gut instinct. Not knowing what she is doing to make you think this she may be saying she will do things then back out, lead you on, get what she wants from you then ignore you until she wants something again - there could be a variety of things she will do. Competely agree with the answer above; but the main thing to remember is that the girl (or boy) will be treating you like you're the only person in the world at one point in time...and then after they break their plans with you they will act very distant. Almost as if the two of you just met. Also beware of continuous excuses for breaking dates; being overly-posessive despite the fact that you two aren't a couple; overly-curious about you're relationships with the opposite sex etc. This person wants to maintain a monopoly over you're heart / mind / body etc so they will be very manipulative and controling in their actions...if it get's this far and you haven't seen the signs one of you're friends should have pulled you to the side by now and leveled with you. After you comfirm (realize) that the person is playing games...cut them out of your life completely.