This is possibly part of the info she was trying to hide:
Article Excerpt:
Orlando-based computer forensics expert Richard Connor was able to unlock data contained in Martins cell phone. Connor used Cellebrite software to delve into Martins phone and access secret text messages, including .bin files which contain all the data, all the files in a cell phones memory. That data was not reported in the analysis of Martins cell phone turned over by the state.
Connor testified that according to the text messages, Mr. Martin was either trying to purchase or sell a handgun. Connor said that Martin was looking to purchase a gun between February 18 and February 22, days before he left to visit his father in the Sanford, Florida neighborhood where he was shot on February 26.
He said Martin was attempting to obtain a gun from a person going by the name Diamond a known nickname for Rachel Jeantel, the young woman who was on the phone with Martin moments before he was shot.
http://dailycaller.com/2013/07/09/judge-to-consider-allowing-martins-texts-in-zimmerman-case/