I can't figure out why she didn't ask the Imam about what she had heard. I would have.
Probably because she wanted to live.
Doing so would have blown her "cover". The Imam assumed so didn't understand Arabic and coveyed that to the others in the room. As a consequence, they assumed they could speak freely in Arabic without having the rabid conversion "overheard" by someone who might not be sympathetic to the message. She wasn't interested in finishing her day with a cut throat or a flaming gasoline shower.
She likely didn't talk to the Imam because she doesn't want to tip her hand that a caucasian woman seated in the back understands exactly what they're saying in Arabic amongst themselves. If the story happened exactly as narrated, I would encourage her to continue this same practice of attending the "friendly" meetings and arriving "early" to read her books.
~ Blue Jays ~
Laura Mansfield investigates terrorists like Steven Emerson. She isn't there to change their minds. This series she did was scary for sure. Just like finding out our biggest mosque on LI was collecting money to kill Jews in Israel.
Laura's bio on her site
http://www.lauramansfield.com/j/contact.asp