The reason why the author has a hard time finding a specific diagnosis is because her "maladaptive daydreams" are a symptom, not a disease. Her real problem is an inability or unwillingness to engage with reality, which is a component of any number of personality disorders.

Really, this inclusion of ridiculously overspecified symptoms and diseases-du-jour in the DSM has got to stop. It makes a mockery of what little credibility psychology has left.