I, Annie, just stumbled across this website after looking through the book, How To Make And Keep Friends: Tips for Kids to Overcome 50 Common Social Challenges by Nadine Briggs and Donna Shea, who describe themselves as "friendship experts and social coaches." The book has lots of ideas that can be discussed, acted out, and practiced at home. The blog has tons of awesome messages/help for parents. Check it out!
http://www.howtomakeandkeepfriends.com/category/social-coaching/
http://www.howtomakeandkeepfriends.com/category/social-coaching/