She doesn't need to reveal what her concerns might be, but I do see it as unhelpful that she won't give any firm guidance as to her intentions.

If you are looking for f2f and she is unable to commit to a timeline for that, then perhaps seeking a different therapist would be in order.

Before you do that, though, you might want to be sure that f2f is sufficiently important that you are willing to deal with the inconvenience of finding and getting to know someone new. Maybe a list of pros and cons of changing therapists would be worth making?