Blank RSS Feed Page

Clients website is here: http://www.drsheilaherenow.net/

And she’s having some linking problems with her RSS feeds. For example, if you follow her link here:
http://www.drsheilaherenow.net/feed/

It opens up as a new tab, with nothing there. It’s completely blank. Same with this link: http://www.drsheilaherenow.net/comments/feed/

I don’t even know what to tell her. Does anybody know anything?

[ Please do not bump, it’s not permitted here. ]