<P> On May 14, 2014, her mother, Janelle Louise Harshman, died from breast cancer after a 20 - year battle with the disease . </P> <P> At the age of two, Harshman's grandmother entered her in a beauty pageant . At 3, she was involved in dance and gymnastics . At 5, she learned to play piano, and at 8, she began acting and met her first manager . </P> <P> She has appeared in The Big Bang Theory as Alex Jensen, the assistant of Sheldon Cooper, and in NCIS as Delilah Fielding, a wheelchair - bound analyst at the US Depertment of Defense and the wife of Timothy McGee . Harshman starred on the short - lived TV shows Run of the House and Center of the Universe . Her movie appearances include Sorority Row and College Road Trip . </P> <P> In 2005, Harshman was nominated for two awards at the Young Artist Awards, one for Best Performance in a TV Movie, Miniseries or Special by a Supporting Young Actress for The Even Stevens Movie (2004) (TV) and the other for Best Performance in a TV Series (Comedy or Drama) by a Supporting Young Actress for Even Stevens (2001). In 2009, Harshman won the ShoWest "Female Stars of Tomorrow" award at the ShoWest Convention along with fellow Sorority Row cast members Briana Evigan, Leah Pipes, Rumer Willis, Jamie Chung and Audrina Patridge . </P>

Who plays tim mcgee's girlfriend on ncis