Question: When did Sarah Polley become known as a child actor?

Context paragraphs:
I Shout Love: I Shout Love is a 2001 Canadian short film written and directed by Sarah Polley, released in 2001.  The film stars Matthew Ferguson and Kristen Thomson as Bobby and Tessa, a couple who are on the verge of breaking up when Tessa convinces Bobby to spend one last night together recording video of them reenacting the better times in their relationship.

Child actor: The term child actor or child actress is generally applied to a child acting on stage or in motion pictures or television, but also to an adult who began his or her acting career as a child; to avoid confusion, the latter is also called a "former child actor".  Closely associated is teenage actor or teen actor, an actor who reached popularity as a teenager.

David Wharnsby: David Wharnsby (born June 20, 1977) is a Canadian film editor.  He was married to award-winning director and actress Sarah Polley.

Away from Her: Away from Her is a 2006 Canadian drama film written and directed by Sarah Polley and starring Gordon Pinsent, Julie Christie and Olympia Dukakis.  The feature-length directorial debut of Polley, the film is based on Alice Munro's short story "The Bear Came Over the Mountain", from the 2001 collection "Hateship, Friendship, Courtship, Loveship, Marriage".  Executive produced by Atom Egoyan and shot in Ontario, it debuted at the 2006 Toronto International Film Festival.

Jon Gustafsson: Jon Gustafsson is an Iceland born film director.  The Icelandic spelling of his name is Jón Gústafsson.  Best known for directing the Canadian documentary film Wrath of Gods, starring Gerard Butler, Wendy Ord, Sarah Polley, Paul Stephens and Sturla Gunnarsson.  He grew up in Iceland where he started his career as a television performer before studying filmmaking at Manchester Polytechnic and directing for film and theatre at CalArts where he was mentored by the legendary Ealing Studios director Alexander Mackendrick.  Wrath of Gods was his second documentary for CBC Newsworld, the first one was The Importance of Being Icelandic.  He immigrated to Canada where he directed the low-budget feature film Kanadiana and the music video Brighter Hell for the Canadian rock band The Watchmen.  In 2011 Jon Gustafsson produced the award winning short film In A Heartbeat, directed by Karolina Lewicka, through his production company Artio Films.

Stories We Tell: Stories We Tell is a 2012 Canadian documentary film written and directed by Sarah Polley and produced by the National Film Board of Canada (NFB).  The film explores her family's secrets—including one intimately related to Polley's own identity.  "Stories We Tell" premiered August 29, 2012 at the 69th Venice International Film Festival, then played at the 39th Telluride Film Festival and the 37th Toronto International Film Festival.  as well as the 70th greatest film since 2000 in a 2016 critics' poll by BBC.

Go (1999 film): Go is a 1999 American crime comedy film written by John August and directed by Doug Liman, with intertwining plots involving three sets of characters.  The film stars William Fichtner, Katie Holmes, Jay Mohr, Sarah Polley, and Scott Wolf and features Taye Diggs, Breckin Meyer, Timothy Olyphant, Desmond Askew, Jane Krakowski, J. E. Freeman, and Melissa McCarthy in her film debut.  The film performed moderately at the box office, but was critically acclaimed.  It has since become a cult classic.

Alias Grace (miniseries): Alias Grace is a Canadian-American television miniseries directed by Mary Harron and starring Sarah Gadon.  It is based on the 1996 novel of the same name by Margaret Atwood and adapted by Sarah Polley.  It will air on CBC Television in Canada and will stream on Netflix globally.  The series will consist of six episodes.  It is scheduled to be released on CBC on September 25, 2017, and on Netflix on November 3, 2017.

Elizabeth Klinck: Elizabeth Klinck is a visual researcher and clearance specialist in the Canadian and international documentary film industry.  Some of the notable projects she has worked on include Werner Herzog's Into the Inferno, Thorsten Schütte ", Barry Arvich's Quality Balls: The Story of David Steinberg, Sarah Polley's the Stories We Tell and Neil Diamond's Reel Injun.

Sarah Polley: Sarah Ellen Polley {'1': ", '2': ", '3': ", '4': "} (born January 8, 1979) is a Canadian actress, writer, director and political activist.  Polley first garnered attention as a child actress for her role as Sara Stanley in the Canadian television series "Road to Avonlea" (1990–1996).  She has starred in many feature films, including "Exotica" (1994), "The Sweet Hereafter" (1997), "Guinevere" (1999), "Go" (1999), "The Weight of Water" (2000), "My Life Without Me" (2003), "Dawn of the Dead" (2004), "Splice" (2009), and "Mr. Nobody" (2009).

Supporting paragraphs: Sarah Polley Child actor
Answer: who reached popularity as a teenager.