Are there signs she is crushing on me or is it just chit chat?

It is just chitchat. You have something in common, and she talks it out. Gals are that way, they have complicated social needs. Take her up on the drink. Expect nothing else. Go with the flow. You might eventually have a good friend here. By the way, relationships and jobs don;t mix - if you did something and it went south, that would open the door to sexual harassment issues for both you and your employer. Remember it is not the intent, it is the perception of the, "victim," that is the real problem here.