what do you think

You return a message, introduce yourself by your first name, and do a brief intake with a woman over the phone. As you are ending the conversation, you realize that you know this person from your place of employment. She works in a support capacity to the clinical staff; and on one or two occasions has typed progress notes for you. The next day at work, it seems that she did not realize she was speaking to you on the phone. You are fairly certain she will show up at the group the next evening. What do you do? What are the ethical considerations in this case?