Just a guess here, but maybe you need to acknowledge her first, some kind of legal thing? Many people don't want anyone to know they are in therapy, so maybe, since she knows you are near your place of employment, she's letting you decide if you want to talk to her or not.
That she's bringing it up I think, is letting you know it's okay to approach her if you see her. You could just come out and ask her. Or simply tell her you haven't seen her, sorry. Or you feel uncomfortable talking with her outside of your appointments. Or ask her if she minds if you do see her, if you stop to say hello. What ever you feel is appropriate in regards to your feelings about the situation.
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