LinkedIn is one of the main recruiting tools: recruiters use it every day to extend their ability to find people who meet specific job descriptions, in seconds, across the country and all over the world. And that's without using the Linkedin online ad capabilities. There is no reason that you should know about the huge adoption of Linkedin in the recruiting community. I know about it, of course, but Cathy really needs to know about it, just to be competitive.
I know that you're thinking about it for her to find another job, but this is a primary recruiting tool. If she's not versed in it, no wonder she's worried about finding another job. She needs to know about it, and know how to use it, if she ever hopes to find another recruiting job, even if her new employer isn't interested in using it (and I would find that surprising too). And that's on top of using it to find a job for herself.
So, for example, run a Google search on these words: Linkedin recruiter. There are millions of hits. Here's the Corporate Linkedin recruiter page:
Here's their talent solutions page:
Here's maybe the best page, showing solutions for Recruiters, Job Seekers, and Sales Professionals (look at the navigation across the top, and also, notice the pricing for recruiters—they couldn't get those kinds of $$ if it wasn't hugely helpful in the recruiting process):
Here's the Wired article about why you should really care about Linkedin:
And a few more articles (I like the NT Times article the best):
And after all that, you can visit Amazon, and run the same search. You'll find another 80 results, including several books that tell people how to use it to recruit and more telling people how to use it to *be* recruited.
I am happy to talk with her for 15 minutes about this, but I'm not well versed with its recruiting capabilities. I can tell her that they are there. I can explain about the 200-million-person network. I can do all of those things, and would be happy to do so.