Embarrassment for revealing unreciprocated feelings can often cause one person to ignore another. Organise to meet with her in a casual, non romantic setting, like having a coffee or going for a walk together somewhere with lots of people around. She's embarrassed right now, but the feeling will subside. If she has told you that she likes you, gently let her know that you are flattered but that you don't feel the same way. Reassure her that you value her and the friendship and before you part, organise to do something with her again. If she hasn't told you about her feelings, she may be unsure of how much you've guessed. Still meet with her, but don't mention her feelings for you at all. Be careful not to lead her on, but cautiously let her know that you are not available to her as a partner. You could casually suggest another potential partner, or mention someone else that you possibly "like". If she is still shutting you out, persevere with contacting her. Sometimes it's very hard for men and women to remain friends; often it either becomes a relationship or the friendship drifts apart. I hope you two can work it out.