She stepped into the world of showbiz as an actress in 2009. That year on October 12, she featured as Little Girl in episode 4 of Season 4 of the NBC aired American science fiction television drama series ‘Heroes’ titled ‘Hysterical Blindness.’
In a couple of months time, on November 18, 2009, she guest starred as Dani Forester in a single episode of the popular American police procedural crime drama television series ‘Criminal Minds’ titled ‘Outfoxed.’
She first drew attention featuring as Samantha Wright in the January 12, 2010 released short thriller film ‘Takeo’ directed by Omar Samad. Her remarkable performance in it earned her Best Actress honour at the New York International Film Festival. That year she also played Lost Girl in the short film ‘Night Blind.’
In 2010 she also appeared in a few big-screen flicks. These include playing Lisa in the zombie comedy ‘ZMD: Zombies of Mass Destruction’; Young Alice (older version played by Amber Heard) in the American supernatural psychological horror film ‘The Ward’; and Sarah Detzer in the American drama film ‘The Opium Eater.’
She essayed the role of Kayla Edwards in the first episode of the American police procedural drama television series ‘Chase’ titled ‘Pilot’ that was aired on September 20, 2010 on NBC. That year she also guest starred as Girl in the October 25 aired episode ‘How Much Is That Liam in the Window’ from the American teen drama television series ‘90210.’
The following year on June 20, she featured in the episode titled ‘Swords and Magic’ from the Disney XD aired American martial arts-inspired comedy television series ‘Kickin' It.’ That year she also appeared in the television movie ‘The Bling Ring’ as Izzy Fishman.
The February 8, 2013, released American 3D science fiction monster horror film ‘Spiders 3D’ saw her playing the role of Emily.
The directorial debut of William Robert Carey, ‘Angels in Stardust,’ a coming-of-age comedy drama American film, saw her essaying the role of Annie. The film that released in the US on February 21, 2014, had Alicia Silverstone, AJ Michalka, Michael Spears and Billy Burke in starring roles. That year she also guest starred in the popular ABC aired American medical drama television series ‘Grey's Anatomy’ in its episode ‘Don't Let's Start’ that was broadcast on November 6, 2014.
The September 18, 2015, released martial arts film ‘The Martial Arts Kid’ featured her in the role of Julia. Other acting pursuits of Sweeney that year included playing Emma in the film ‘Stolen From Suburbia’; Leah in the short film ‘Love Made Visible’; and Little Janey Hutchins in the short film ‘The Unborn.’
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She landed up in the starring role of Kelsey Connors in the Harvey Lowry directed thriller film ‘Cassidy Way.’ The film that released on February 23, 2016, also had Stan Shaw and Randy Wayne in starring roles. That year she also played the lead role of Hailey Summers in the May 6 released action horror film ‘The Horde’ directed by Jared Cohn.
The August 25, 2017 released romantic comedy film ‘Vikes’ starred her in the role of Ida. The film that was written and directed by Tenney Fairchild also had Aidan Alexander and Noah Munck in starring roles. The comedy film ‘Dead Ant’ starring Tom Arnold, Martin Blasick and Sean Astin that released on October 10 that year featured Sweeney in the role of Sam. That year she also appeared in the short film ‘It Happened Again Last Night’ as Young Paige.
In 2017 she garnered one of the most notable roles of her career, Haley Caren, in the web series ‘In the Vault.’ She featured in seven episodes of the series.
The May 9, 2017, aired episode ‘The Final Final’ from the American sitcom TV series ‘The Middle’ featured her as Female Student #1. That year she also guest starred as Willa in the June 27 aired episode ‘Til DeAth Do Us Part’ from the American teen drama mystery thriller television series ‘Pretty Little Liars’; and also voice played as Madeline Rayon in the animated TV series ‘Monster School Animation’ in its episode titled ‘ Welcome to Monster School.’
She played the leading role of Ally in the Lance Tracy written and directed thriller film ‘Relentless’ that released on February 6, 2018.
The Ben York Jones and Michael Mohan created American comedy drama web television series ‘Everything Sucks!’ that premiered on Netflix on February 16, 2018 saw her playing one of the main characters of Emaline Addario. She featured in all the 10 episodes of the series that garnered mixed to positive reviews from critics but was however cancelled by Netflix after one season.
The comedy thriller TV movie ‘The Wrong Daughter’ that released on April 15, 2018 featured her in the starring role of Samantha. She also played Missy 'Paper Girl' in the TV short ‘Manic’ that year. She starred as Ashley in the April 21, 2018 released drama, horror thriller film ‘Tell Me Your Name.’
Season 2 of the Bruce Miller created American dystopian drama web television series ‘The Handmaid's Tale’ that started airing on Hulu from April 25, 2018, features her in the recurring role of Eden.
The David Robert Mitchell written and directed American neo-noir comedy-drama film ‘Under the Silver Lake’ that has Andrew Garfield, Topher Grace and Riley Keough in starring roles features Sweeney in the role of Shooting Star. The world premiere of the film happened on May 15, 2018, at the 2018 Cannes Film Festival. The film is planned for a December 7, 2018, release by A24.
The other film of Sweeney that is scheduled for a 2018 release is the Lara Gallagher written and directed drama thriller ‘Clementine’ that will see her playing the starring role of Lana.
She will also be seen playing the recurring role of Alice in the forthcoming American TV psychological thriller miniseries ‘Sharp Objects’ that is based on the first novel of Gillian Flynn bearing same title. The miniseries all of 8 episodes is scheduled to premiere on July 8, 2018 on HBO.