Horse Girl features a superb performance from writer-star Alison Brie while the film also has something to say about mental illness. Sarah (Alison Brie) works at an arts and crafts store with Joan (Molly Shannon). While it pays the bills, Sarah would rather be taking care of her favorite horse or watching her favorite supernatural TV show. Much to the dismay of roommate Nikki (Debby Ryan), of course. Nikki does her best to get Sarah…"Sundance 2020: Horse Girl"