Lillian in the given case most likely has borderline personality disorder.
More about the borderline personality disorder:
The mental health illness known as borderline personality disorder (BPD) is characterised by impulsivity, interpersonal relationship instability, and significant mood swings.
One of the "Cluster B" personality disorders, which are characterised by dramatic and unpredictable behaviours, is borderline personality disorder. Personality disorders are characterised by persistent, rigid, dysfunctional behaviour patterns that cause social problems and discomfort.
Normally by emerging twenties, borderline personality disorder manifests itself. Young adulthood seems to be when the problem is worse, and it may progressively become better as people age.
Learn more about the borderline personality here:
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