Snubbed by a girl playing hard to get?

Been talking to this girl and she seems rather interested in me, i have a strong feeling. But when i asked her out, she rejected and say she has to take care of her sis ( well fair enough ) and suggested to go out tomorrow. When i asked her again at night if she wants to go out with me the next day, she turned me down and say that she feels like staying at home! I seldom get rejected like this and frankly i am feeling quite pissed right now. Really feel like she is playing hard to get, and i really want to play the game back on her. What would you have done?