Ramm was born in Collin County, Texas. At the age of three, she began dancing in local studios. At nine, she began booking roles in indies and shorts. She has appeared in nationwide commercials for Hasbro and Dell Computers. She was featured on the May and June issues of American Girl in 2002. Ramm moved to Los Angeles at age 11 with her mother; her father and brother stayed behind in Texas for the first few years.
After moving to Los Angeles, Ramm booked guest roles on CSI: Crime Scene Investigation and Yes, Dear, and landed the role of Brittany Loud in the 2005 film Flightplan. She appeared in the 2005 film Yours, Mine and Ours. The same year, Ramm was cast as a younger version of Jennifer Aniston's character in Rumor Has It..., and while her scenes did not make the final cut after the script was rewritten, she can be seen in various still photographs throughout the film.
In 2006, she appeared in X-Men: The Last Stand as the young Jean Grey. In 2007, Ramm was in the movie Mr. Blue Sky as Jessica Green, and appeared as Samantha Jensen in Walking Tall: Lone Justice. In 2007, she also appeared as the young Carine in the feature film Into the Wild, and in the role of Gwen Tennyson in the television film Ben 10: Race Against Time.
In 2007–08, Ramm appeared in a recurring role on the series Without a Trace, and again in a 2009 episode of iCarly with her real-life friend Miranda Cosgrove. Ramm appeared in the 2010 French horror film Rubber as Fiona. In 2011, Ramm was featured in the MTV television film Worst. Prom. Ever., and portrayed victim Jessica Hamilton in the video game L.A. Noire. In 2012, Ramm was cast in the film Disconnect playing the character of Jason Bateman's daughter.
In 2013, Ramm was cast in a main role on the ABC Family drama Chasing Life, playing Brenna Carver, the younger sister of the lead character played by Italia Ricci.
|2002||Slap Her... She's French||Little Starla Grady|
|2005||Yours, Mine and Ours||Kelly Beardsley|
|2006||X-Men: The Last Stand||Young Jean Grey|
|2007||Walking Tall: The Payback||Samantha Jensen|
|2007||Walking Tall: Lone Justice||Samantha Jensen|
|2007||Into the Wild||Carine McCandless – age 11|
|2007||Mr. Blue Sky||Jessica Green|
|2010||Bond of Silence||Jordan|
|2014||Dakota's Summer||Dakota Rose|
|2004||CSI: Crime Scene Investigation||Emily||Episode: "Turn of the Screws"|
|2004||Yes, Dear||Georgia||Episode: "Couples Therapy"|
|2005||Catscratch||Caitlin #1||Episodes: "Slumber Party", "Tale of the Tail"|
|2005–06||CSI: Miami||Jennifer Wilson – Age 9||Episodes: "Under Suspicion", "Skeletons"|
|2006||Grey's Anatomy||Shannon||Episode: "Time Has Come Today"|
|2007||ER||Tasha||Episode: "Crisis of Conscience"|
|2007||Ben 10: Race Against Time||Gwen Tennyson||TV film|
|2007–08||Without a Trace||Jen Long||Recurring role (6 episodes)|
|2008||Eleventh Hour||Emily Stanner||Episode: "Agro"|
|2009||The New 20's||Kayla||TV short|
|2009||The Unit||Amber||Episode: "Hill 60"|
|2009||iCarly||Missy Robinson||Episode: "iReunite with Missy"|
|2009||Hawthorne||Devon||Episode: "Trust Me"|
|2009||Three Rivers||Megan O'Leary||Episode: "Where We Lie"|
|2010||The Odds||Molly Cooper||TV film|
|2010||Bond of Silence||Jordan||TV film|
|2010||Lie to Me||Amy||Episode: "Darkness and Light"|
|2010||NCIS: Los Angeles||Amanda||Episode: "Little Angels"|
|2011||Worst. Prom. Ever.||Heather Spencer||TV film|
|2011||L.A. Noire||Jessica Hamilton (voice)||Video game|
|2011||The Protector||Madison||Episode: "Class"|
|2012||Mentalist||Liesl Braddock||Episode: "Ruddy Cheeks"|
|2013||Nikita||Helen Collins||Episode: "Broken Home"|
|2014–15||Chasing Life||Brenna Carver||Main role|
|2016||The Originals||Ariane||Recurring role|