It sounds to me like she did the exercise with the line in the room then crossing it to make sure you CAN tell when your boundaries are being crossed because you are not speaking up and saying, "Hey, you crossed a boundary, stop it!" like you should be. Other people don't know where our boundaries are, we have to tell them and if we don't tell them, how can they/T's know if we don't know where our boundaries are or if we are just not speaking up and letting others know where they are? That's what she's trying to figure out and teach you.

The not telling you about who she knows or doesn't she isn't hiding from you, it's not a social situation where you're playing "who do you know?" to see how you might connect, it's your therapy and only those things that have anything to do with what is happening in the room between the two of you is part of the ongoing conversation. So what if she does/does not know your friend, your ex-, your sister's boyfriend's teacher? That's not part of your therapy.