Girl, Interrupted In "Girl, Interrupted," the novelist Susanna Caisson, 43, uses a series of vignettes to describe her experiences as a teen-age mental patient in 1967-68. Using herself as a troubled - and troubling - example, Kaysen demonstrates with humor the severe problems with diagnosis, the sensation of psychiatric hospitalization and the callousness of even the most upper-class of families and hospitals. "Lunatics," says Kaysen, "are similar to designated Hitlers. Often an entire family is crazy, but since an entire family can't go into the hospital, one person is designated as crazy and goes inside." Although she says very little about her family, she clearly sees herself as the fam