that shit is a fine line. if you catch feelings and it isn't mutual the best thing to do is move on immediately. even though a chick might be a dirty skunt unless she's your girl you can't call them on it. in that scenario its just not your place. now, if she's your girlfriend by all means, talk to her about but since she's not all you can do is watch from afar.
i'd still go. if it's weird for you, talk to her and explain why you said what you said and apologize. if it's not weird for you then don't worry about. either way you should still go. don't let someone else jeopardize your happiness.