OK. Feeling like she's a friend and being one are two different things. If you do not have a rapport with her outside of the coffee house, then this really isn't a friendship. It's a friendly person that knows your name and what you usually have when you come in.

Also, I've worked in customer service for many years, and now I train people on how to better do their jobs. While conversations with customers aren't outlawed, it is always persuaded that a conversation with a customer remain friendly, comfortable, and brief. Employees can get reprimanded for engaging even in seemingly innocent small-talk. Most customer service places are like that.

There is no reason to take the fact that she's not conversing as much with you personally. Please keep in mind that she is there to do her job, and engaging in long conversations takes her away from doing it.

I hope this helps.