I think she meant PageRank Button...
Did she mean 'showing PR' on her site, or showing PR in terms of the site, because she obviously knew her PR. Why would there be a need to show it unless she meant actually showing it on the site itself.
If the latter is what she's looking for, she wants a PageRank Button.
There's a lot of them to choose from on the Net, which come in a couple different colors (though I haven't seen too many variations), all of which are free to use. I'm not sure how they impact your pagerank, though. They may lower it because search engines like Google look down upon frequent rank queries, which I believe is what buttons like these do. But I haven't found any literature on them hurting rank. I just suspect it. Time will tell. I'm actually running a test on one now. Gotta wait it out though.
Good luck, friend,
The Lion.