Emily Sheehan was a big winner at the 35th Annual Redstone Film Festival on Wednesday. Her short film, "After," took third prize in the Boston University competition, and she was also named the recipient of this year's Adrienne Shelly Production Grant. The prize, named for the late actor-writer-director Adrienne Shelly, best known for the film "Waitress," helps women filmmakers produce their work. The honor was presented by Shelly's stepdaughter Emily Ostroy, who's a local. Sheehan, 21, a senior from Seattle, will receive $5,000 for her unproduced short, "Skipping Stones." She tells us it's about an estranged brother and sister who are struggling to get over longstanding resentment. "It's them trying to move past the ghost of their father in light of his death." Sheehan says she has already cast Emma Gruttadauria and Ross MacDonald as the leads. "We're thinking of shooting it in Nahant, which is where we shot 'After,' " she said. "I have a friend there with a beautiful house on the water."