I'm concerned about the 'ultimatum' that your t has given you. There should be no pressure at all in therapy. Especially as it is only your third session.

I had an awful time talking to my therapist, and was the main reason why I went into therapy. I would literally sit in my sessions and most of it would be in silence because I just would not open up or talk. I used to be so terrified to talk. About anything. My t would just sit and wait and perhaps prompt me now and again to help me along in the very first few sessions.

As doogie suggests, this may be a red flag if she is pressuring you and does not have the patience to sit with your silence. As silence says more than words can ever say!