Maybe she's shy, inexperienced, or uncomfortable? All three even. Tell her what you like in a delicate way. Play a fun game... "I want to experiment with you because I'm so in to your body. I'll try something new with you and then you try it on me. Then you lead and I'll follow." Not everyone is comfortable with their sexuality or exploring the unknown." Laughing or ignoring a partner happens sometimes as a defense mechanism for one's own insecurity.