A 34-year-old female with complex PTSD secondary to prolonged childhood sexual abuse presents for treatment planning. She reports daily intrusive memories, severe dissociative episodes occurring two to three times weekly (lasting 15 to 45 minutes each during which she is unresponsive), chronic emotional dysregulation with frequent self-harm through cutting, and persistent difficulty maintaining employment due to interpersonal conflict with authority figures. She has no current suicidal ideation but has had three psychiatric hospitalizations in the past year for suicidal crises following self-harm episodes. She is currently sober for four months after completing residential treatment for alcohol use disorder and is engaged with a substance use counselor. She is requesting to begin 'trauma processing' immediately, stating she wants to 'get it over with.' Which treatment sequencing approach is most appropriate for this patient?