Because you are not your T's friend. She can help you with social skills inside your therapy hour. If she doesn't engage in a chat with you in public, you shouldn't feel dismissed or rejected (i.e., she is not "running away from you.") Most likely it's about maintaining her own personal boundaries as well as ethics, and she has her own life she is living outside of her office.

If you continue to push your agenda regarding a very hypothetical situation onto every T you meet with, I think you are going to lose out on a T who could possibly be very good for you.