| Year | Title | Role | Notes |
|---|
| 1998 | Digging to China | Harriet Frankovitz | limited release |
| Practical Magic | Kylie Owens | Nominated — Young Artist Award for Best Performance in a Feature Film - Supporting Young Actress |
| Profiler | Chloe Waters | 6 Episodes
Nominated — Young Artist Award for Best Performance in a TV Drama Series - Supporting Young Actress |
| 1999 | Down Will Come Baby | Robin Garr | TV Film
Nominated — YoungStar Award for Best Performance by a Young Actress in a Mini-Series/Made for TV Film |
| 1999–2002 | Once and Again | Jessie Sammler | 55 Episodes
Young Artist Award for Best Ensemble in a TV Series (Drama or Comedy)
Nominated — YoungStar Award for Best Young Actress/Performance in a Drama TV Series |
| 2002 | Little Secrets | Emily Lindstrom | Nominated — Young Artist Award for Best Performance in a Feature Film - Leading Young Actress |
| S1m0ne | Lainey Christian | |
| The West Wing | Hogan Cregg | 1 Episode |
| 2003 | C.S.I. | Nora Easton | Got Murder? - Season 3, Episode 12 |
| The Missing | Lily Gilkeson | Nominated — Young Artist Award for Best Performance in a Feature Film - Leading Young Actress |
| Thirteen | Tracy Louise Freeland | Bratislava International Film Festival Award for Acting
Las Vegas Film Critics Society Award for Youth in Film
Phoenix Film Critics Society Award for Breakout Performance - On Screen
Prism Award for Best Performance in a Theatrical Feature Film
Nominated — Broadcast Film Critics Association Award for Best Young Performer
Nominated — Golden Globe Award for Best Actress – Motion Picture Drama
Nominated — MTV Movie Award for Best Breakthrough Female Performance
Nominated — Phoenix Film Critics Society Award for Best Actress
Nominated — Phoenix Film Critics Society Award for Best Performance by a Youth in a Lead or Supporting Role - Female
Nominated — Satellite Award for Best Actress - Motion Picture Drama
Nominated — Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Leading Role
Nominated — Washington D.C. Area Film Critics Association Award for Best Actress |
| 2005 | Pretty Persuasion | Kimberly Joyce | limited release |
| The Upside of Anger | Lavender 'Popeye' Wolfmeyer | |
| 2006 | Running with Scissors | Natalie Finch | |
| Down in the Valley | October "Tobe" | limited release |
| Asterix and the Vikings | Abba (English Dub) | limited release |
| Shark Bait | Cordelia (Voice) | Also known as The Reef |
| 2007 | King of California | Miranda | |
| Across the Universe | Lucy Carrigan | |
| Battle for Terra | Mala (Voice) | |
| The Life Before Her Eyes | Young Diana | limited release |
| 2008 | The Wrestler | Stephanie Ramzinski | |
| 2009 | Whatever Works | Melodie | |
| 2009-present | True Blood | Sophie Anne Leclerq | |
| 2011 | The Conspirator | Anna Surratt | |
| Mildred Pierce | Veda Pierce | HBO Miniseries |
| The Ides of March | Molly Stearns | Filming |
