According to this LA Times story:

With blond hair and green eyes, the 46-year-old woman bragged that she could go anywhere undetected, boasting in one e-mail that it was “an honour & great pleasure to die or kill for” jihad, or holy war, the indictment said.

“Only death will stop me here that I am so close to the target!” she wrote.

LaRose was arrested Oct. 15 in Philadelphia but she has not been charged with murder. The federal grand jury indictment was unsealed Tuesday. She came to the attention of the FBI in June 2008 after posting a comment on YouTube under the online moniker “JihadJane.”

In addition to dispelling notions of what terrorists look like, LaRose’s modus operandi underscores that social media can be used for productive as well as disturbing purposes.

Federal officials cited her as an example of how terrorists sometimes boldly operate inside the United States, fearless of the world watching them on the Internet.

“A woman from suburban America agreed to carry out murder overseas and to provide material support to terrorists,” said David Kris, assistant attorney general for the Justice Department’s National Security Division. That, he emphasized, “underscores the evolving nature of the threat we face.”

Michael L. Levy, the U.S. attorney in Philadelphia, said the case shows “the use terrorists can and do make” of communicating through e-mails and videos around the world. He called LaRose “yet another very real danger lurking on the Internet.”

The other danger, authorities said, is that radical jihadists are turning to home-grown U.S. citizens to carry out their plots. “Terrorists are looking for Americans to join them in their cause,” Levy said, adding that LaRose “shatters any lingering thought that we can spot a terrorist based on appearance.”