Wordpress feed stopped working

Hello, I hope someone can help me figure out how to fix my client's wordpress feed.
I just redesigned her site and moved it to godaddy and now her feed doesn't work. I tried deactivating all the plugins, switching to twenty-twelve, re-installed WP, and had her call GoDaddy...nothing worked.
The feed should be here: http://www.inthisplayground.com/feed
The W3C validation tool says "This feed does not validate. Server returned HTTP Error 404: Not Found"
Any pointers would be greatly appreciated, thanks!