Eisenberg was born in East Brunswick Township, New Jersey, to Barry and Amy Eisenberg. She has an older sister Kerri and an older brother Jesse, who is also an actor. She went to Robert Frost Elementary School and went through Hammarskjold (Middle School) and Churchill (Junior High). She is currently enrolled at East Brunswick High School as a sophomore.

Eisenberg is also a juggler; she has attended the NYC juggling festival in 2005, 2006, and 2007.

Eisenberg first became famous in the late 1990s and early 2000s for her role in a series of Pepsi commercials. The students of her elementary school knew her as "the Pepsi Girl". She made her film debut in the 1998 children's film Paulie, playing the young owner of the title parrot. After appearing in a few made-for-television films, she had supporting parts in 1999's The Insider and Bicentennial Man.

In 2000, Eisenberg co-starred with Minnie Driver in the feature film Beautiful, which received generally negative reviews. She also starred as Helen Keller in a television remake of The Miracle Worker. She also played opposite Jeff Daniels and Patricia Heaton in 2004's television remake of the The Goodbye Girl.

In 2006, Eisenberg appeared in How to Eat Fried Worms, the New Line Cinema adaptation of Thomas Rockwell's book of the same name.

In 2007, she starred in the independent feature film "P.J." (http://www.pjthemovie.com - co-starring with John Heard, Vincent Pastore and Robert Picardo).

Broadway

Eisenberg made her Broadway debut in the Roundabout Theatre's production of Claire Booth Luce's play The Women.

Selected filmography
Year Title Role Notes

2008 Wild Child Ruthie
2007 P.J. Pauline
2006 How to Eat Fried Worms Erika
2000 The Miracle Worker Helen Keller
2000 Beautiful Vanessa
1999 Bicentennial Man 7-Year-Old "Little Miss" Amanda Martin
1999 The Insider Barbara Wigand
1998 Paulie Marie Alweather