Question: Who does Lauren Cohan play in the 56th episode, titled "Self Help", of a post-apocalyptic horror television series?

Context articles: Home (The Walking Dead)
Crossed (The Walking Dead)
Supernatural (season 3)
Slabtown (The Walking Dead)
Forget (The Walking Dead)
Made to Suffer
Bela Talbot
Self Help (The Walking Dead)
Consumed (The Walking Dead)
Maggie Greene

"Home" is the tenth episode of the third season and 29th episode overall of the post-apocalyptic horror television series "The Walking Dead".
 It was written by Nichole Beattie and directed by Seith Mann, and aired on AMC in the United States on February 17, 2013.
 In the episode, Rick Grimes (Andrew Lincoln) begins to see visions of his deceased wife and asks Hershel (Scott Wilson) for help.
 Meanwhile, The Governor (David Morrissey) plans an assault on the prison while Daryl (Norman Reedus) and Merle Dixon (Michael Rooker) fend for themselves out in the forest.
"Crossed" is the seventh episode of the fifth season and 58th episode overall of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC on November 23, 2014.
 It was written by Seth Hoffman and directed by Billy Gierhart.
 In the episode, Michonne and Carl Grimes stay at the barricaded Church with Gabriel Stokes as Rick Grimes and the others go on a rescue mission for Beth Greene and Carol Peletier in Atlanta.
 The episode received generally positive reviews, though most noted the set up for the mid-season finale.
 This is the first episode to feature all credited series regulars for the fifth season.
The third season of "Supernatural", an American fantasy horror television series created by Eric Kripke, premiered on October 4, 2007, and concluded on May 15, 2008.
 Traveling throughout America, protagonists Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) use their father's journal to help them carry on the family business—saving people and hunting supernatural creatures.
 The season begins with the brothers tracking down the demons released from Hell in the previous season finale.
 They become allies with a demon named Ruby (Katie Cassidy), who claims to know a way to release Dean from his demonic pact—he had sold his soul to a demon and was given a year to live in exchange for Sam's resurrection—and wants to protect them from the new demonic leader Lilith.
 As Dean's deadline approaches, their efforts are further hindered by Bela Talbot (Lauren Cohan), a professional thief of occult items who is often at odds with the Winchesters.
"Slabtown" is the fourth episode of the fifth season and 55th episode overall of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC on November 2, 2014.
 The episode was written by Matthew Negrete and Channing Powell, and directed by Michael E. Satrazemis, who is the series' director of photography.
 In the episode, Beth Greene (Emily Kinney) finds herself in an operational hospital in Atlanta after being abducted in the previous season.
 Beth discovers that the hospital is ruled by a brutally enforced system and slowly plans her escape.
 Emily Kinney and Melissa McBride are the only regulars to appear in this episode, though McBride only appears in the final scene, whereas Kinney appears throughout the episode.
"Forget" is the 13th episode of the fifth season and 64th episode overall of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC on March 8, 2015.
 The episode was written by Corey Reed and directed by David Boyd.
 The events of the episode adapt material from "Volume 12", "Issue #72" of the comic book series.
 In the episode, Rick and the others try to settle in with the community of Alexandria at Deanna Monroe's party.
 However, some of the characters are unable to adjust to new life after their struggles on the road such as Sasha Williams, who suffers from PTSD over her losses.
 Meanwhile, Carol Peletier devises a plan to steal back the group's weapons undercover.
"Made to Suffer" is the eighth episode and mid-season finale of the third season, and 27th episode overall of the post-apocalyptic horror television series "The Walking Dead".
 It was directed by Billy Gierhart and written by Robert Kirkman, and aired on AMC in the United States on December 2, 2012.
 In this episode, Rick (Andrew Lincoln), Daryl (Norman Reedus), Michonne (Danai Gurira), and Oscar (Vincent Ward) enter Woodbury in search of Glenn (Steven Yeun) and Maggie (Lauren Cohan).
 Meanwhile, a new group of survivors encounters the prison.
Bela Talbot is a fictional character on The CW Television Network's drama/horror television series "Supernatural", portrayed by Lauren Cohan.
 Appearing only in the third season, she uses knowledge of the supernatural world to her advantage rather than to help those in need.
 Self-centered and a thorn in the side of the series' protagonists, Bela makes her living by stealing occult objects and selling them to wealthy clients.
 Critical reaction to the character was mixed, with negative responses from fans ultimately leading to her departure at the end of the season.
"Self Help" is the fifth episode of the fifth season and 56th episode overall of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC on November 9, 2014.
 The episode was written by Heather Bellson and Seth Hoffman, and directed by Ernest Dickerson.
 The episode centers on Abraham Ford, Eugene Porter, Rosita Espinosa, Tara Chambler, Glenn Rhee, and Maggie Greene, who have left the church and their fellow survivors to pursue a mission to Washington, D.C., by bus.
 Upon their journey, they encounter numerous problems, and Abraham's past and his keen desire to continue on the mission are explored throughout the narrative.
"Consumed" is the sixth episode of the fifth season and 57th episode overall of the post-apocalyptic horror television series "The Walking Dead" which aired on AMC on November 16, 2014.
 The episode was written by Matthew Negrete and Corey Reed, and directed by Seith Mann.
 The episode primarily focuses on Carol Peletier (Melissa McBride) as she accompanies Daryl Dixon (Norman Reedus) in searching for Beth Greene (Emily Kinney).
 Several flashbacks in the episode explore the different stages in Carol's life, such as her rescue mission to save the group and several tragedies she is attempting to rebound from, including the deaths of her surrogate daughters, Lizzie Samuels and her sister, Mika, as well as the lasting effect of her banishment.
 The title of the episode refers to Carol's explaining to Daryl about the events in her life and how she has changed, saying that "everything now just... consumes you".
Maggie Greene is a fictional character from the comic book series "The Walking Dead", portrayed by Lauren Cohan in the television adaptation.