Linehan diagnosed her with borderlinepersonalitydisorder, an extreme inability to regulate moods, and prescribed a type of counseling called dialectical behavior therapy.
In this scenario we'd probably be better served to consider her as having something like borderlinepersonalitydisorder with a history of major depression.
Reading the literature, she realized that many patients suffered something called borderlinepersonalitydisorder, in which people lack any ability to control everyday emotions.