@Angel23,
Maybe she was trying to follow the work rules about focusing on the customer and not carrying on personal conversations when on duty.
And, it is a lie that you were just responding to her invite to try the food. If that were the case, you had no need to ask her all the other questions and would have just said, "no thanks, I work here too.". The other questions were none of your business.
However, I think the more important issue is that you are still obsessing on it after a year, so much so that you remember the intricate detail of the conversation and her reactions.
Why do you think you do that?