She had a similar reaction to LE searching the landfill. I suspect that she is REALLY having a hard time getting her mind around the idea that the searchers ARE NOT looking for a "live Hailey" and that HAILEY'S ANGELS were NEVER looking for a "live Hailey".
They represent ONE of the avenues being explored by LE. Whereas another group (Clint & Naomi, and perhaps some portion of the official investigation) IS looking for a "live Hailey", this group's purpose is to search for a body. I just think she is in HUGE denial about everything going on. I think she DOES expect Hailey to magically come home alive, and she just hadn't really put 2 and 2 together to realize that these searchers, aren't combing the woods looking for a quaint little cottage where Hailey has been chillin' for the last 2 months, or hoping to find her, lost and a little dehydrated, curled up waiting for rescuers to come at the bottom of a ravine. In spite of Marc Klaas's insistence that she maintain the position that Hailey is alive, even Klaaskids is part of a RECOVERY effort.
This film was probably a little too "in your face" considering her complete inability to accept that Hailey is dead or even hurt, or that Shawn could have done anything to her. Maybe Hailey's Angels did not realize where her head was and how this would affect her, or maybe they did and wanted to give her a dose of reality, as she has not been out with the search parties. Maybe they hope she will see how much effort this group has put into finding her daughter, and provide information she may have withheld previously out of guilt. It's really hard to say what their intent was, or why she reacted as she did, given the number of possibilities.
I'd like to hear from redcat whether she was there, and what really went down.