Did your boss give you a hard-to-hit deadline, but, thankfully, she was there to help you out, even without getting paid for it? You do it when you feel it and, of course, she accepts the gesture.
Rather than it being occasionally mentioned or accepted as a part of who she is, you might find that she seems to talk about it more than you would consider standard when you are around.
Are my expectations just unrealistic? What Do I Do If a Married Woman Likes Me? Kinda stupid to think of it.