Extreme emotional vulnerability is rarely the sole cause of psychological problems, an invalidating environment is also a major contributing factor.

IMO if your T is truly invalidating you, she isn't using DBT. In fact, the one main issue that the "originator" determined was that the patients were not receiving ENOUGH validation with basic CBT, so she changed it with DBT.

DBT: Stage 1 Moving from being out of control behavior to in control. Target one: reduce and then eliminate life threatening behaviors Target two:reduce and eliminate behaviors that interfere with treatment Stage three: decrease behaviors that destroy quality of life Stage four: learn skills that help

Stage 2 Moving from being emotionally shut down to experiencing emotions fully.
Stage 3 Building an ordinary life, solving ordinary problems.
Stage 4 Moving from incompleteness to completeness/connection