File sharing will work great for just that, sharing files. But you can't put a link in a file and have her see it. If you put something in a shared folder you would still have to tell her it was in there. Your best option still is to setup an IM on both pc's and have them running all times when your on. Or the kid thing or train a pet to take a note to her.
Just copy the link URL and paste it into a text document stored in the folder.
Dave's 'Kid thing', or a train sound more fun though 


