A FB Page and a FB App are separate things altogether. When you have an App created, you can use the Facebook Like Box (JFBCFan module) to display information about your FB Page on your website (# Likes, activity stream, user faces).
Beyond that, I'm not sure what you mean by "connect the web site ... to the page she is running". What are you looking to do? With the Facebook App, users will be able to login to the site (if you want) and you'll be able to do a lot of things, but just not sure what you want to do with the FB Page itself on the site.
Hope that helps clarify some things, but definitely keep me posted on what your intent is and we'll help how we can!
Thanks,
Alex