biting of the lip can indicate anxiety, or stress from lying (when not used in a flirtasious enviroment) going by the conversation you indicated that you had, and the reactions you thought you would have on both versions of her answers, then it was most likely anxiety that she did not want you to become attached, or devestated by her response, so it sounds like her response was more to protect you, rather than confuse.

so i guess that in itself indicates that you are special because she is protecting you, even from herself.