"Franny" does not fit any of the Booker plots, since it lacks the trademark paired stages of "improvement" and "worsening" that characterize basically all of Booker's descriptions. However, we can apply the formula to "Zooey," which fits the Rebirth plot. Note, however, that the Booker plots are intended to revolve around the story's protagonist. Zooey is the most likely protagonist of "Zooey," but the Booker plot that fits focuses on Franny's transformation. This is a long-winded way of saying that perhaps Booker plots may not be the most helpful way of analyzing these two stories.
Booker writes that in this stage, the hero lies under the shadow of something "dark" that may "spring entirely from within the hero's own personality." That fits the bill here with Franny; her torment seems to be self-inflicted.
This is the stage where the dark power seems to recede a bit; this doesn't happen here. Franny remains in crisis-mode.
Zooey makes it clear that this is no passing matter; he, too, still feels the after-effects of the education the two of them received from their older brothers at a young age. It sounds like Franny will be dealing with this issue for quite some time. He also vetoes what seems to be a potential fix: psychotherapy.
Far from helping Franny, Zooey seems to really send her over the edge. It looks like he's trying for tough love, but it would seem that this tactic backfires.
Franny is essentially "saved" through this phone conversation, though exactly who does the saving (Zooey? Buddy? Seymour?) is subject to debate.