Didn't read others responses, but my suggestion? LEAVE DBT T immediately! This T is destined to harm you if she's demanding you cut ties with the rest of your treatment team!

My treatment team consists of my T, my dietitian, my psychiatrist, my general doctor, and my DBT therapist. They all work together to ensure I get the best treatment and have the most support possible as I battle this ED (which recovery is going well, finally, after 2.5 years of hell.) The more support you have surrounding you during recovery, the better. My whole team communicates with each other to best help me. Also, it's nice cause there's always at least one person available in emergency situations, instead of only having one person to rely on.