Diagnosis is what therapists/doctors do; they have to have some idea of what they might be treating you for so they can decide if they can help you. As phaset says, if they have no background in what they suspect you may have, they want you to see someone who may be better able to help. That all has to happen in the first few sessions. I would go see her again and talk about this with her, make sure you do/do not want to work with her and/or go see a psychiatrist or whomever she is suggesting to get a second opinion.