Duplicate Blogs

a lady I know approached me about posting duplicate copies of her blog both on her own website and on my forum's blog. She thinks it will increase her traffic, I am worried that google will recognize it as a duplicate and punish me or both of us. Any thoughts?

I would say it might be considered duplicate content.

Does that hurt?

I would advise her to post a summary ("abstract") of her blog post on your site with a link to her site.

That way both sites benefit and theres no copy./paste duplication to worry about.