IMHO the best way to deal with this X muscle is to play it cool. When she said 'i have to check my schedule' she's putting the ball in her court so to speak...be the sounds of it she may have liked you but the initial attraction wasnt strong enough for her to 'not' want to remain in control.
Best thing is to not ignore her, but just be yourself. Be friendly, make her laugh etc just like you were - but just stop giving a **** if she likes you or not. Just stop thinking about her as anything other than friend. If she doesnt like you romantically then she'll still be a friend...and chicks have more chick friends. And if she does like you, she'll eventually give you a signal then its up to you to respond, and the pain in the ass dating game can continue, only this time with you calling the shots.