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!