I left the screening of “Horse Girl” with a deep dissatisfaction, a film that is an odd misstep from director Jeff Baena (“Life After Beth,” “Joshy”). The first half of the film is awkwardly charming, but then it becomes something completely different in the worst possible way. The goodwill earned from the oddball sensibility of the story is derailed when things go in a completely “WTF?!” direction. This is a dark movie that gets weird for no good reason, and it feels like the project becomes a victim of writers (Baena and Alison Brie) who can’t figure out the ending to their story so they tak...