I agree with the others that it is likely your T is limiting her quota. Some clients have much greater needs than others and it is important for the t to balance their caseload so they don't get overwhelmed. "Needs" is not a negative word here. It is only an assessment of what is required. She may already have 4 or 5 clients with a BPD diagnosis and not be able to responsibly support more than that at a time.