What an amazingly horrible headline.  Here's the events from a slightly more even-handed viewpoint:

http://slog.thestranger.com/slog/archives/2012/09/13/activists-summoned-once-again-before-a-federal-grand-jury

She's been granted immunity from prosecution.  That's a very, very different thing than being denied the 5th Amendment right against self-incrimination.  Her concern now is that she no longer has a way to not testify.

The Stranger has more coverage of the events and the actual prosecution: http://slog.thestranger.com/slog/archives/occupy/