Have her check her settings for her posts to make sure they are going to her friends or a Farm Town list she has created. I have a few who also have gone to the new timeline, but I don't have a problem seeing their posts on my newsfeed.
Easiest way to find those posts is to use the following link: http://www.facebook.com/?sk=app_56748925791
Be sure to bookmark this after you go to it the first time so you can use it again. This is a link to the Facebook filter for only Farm Town posts.
Thanks for the link. Works great. Since the new timeline I've had trouble finding friends FT post, and they mine. I put it in my bookmark toolbar and renamed ti FT posts.