Hi T.,
There could be many reasons why your daughter is having trouble making friends. But rather than focus on the why let's find an activity that interests her then find an age appropriate weekly meeting or practice where she can meet people with the same interests (ie photography, cheer and/or dance, sports leagues, musical instrument, theatre, etc.)
Competition cheer and dance brought my daughter out of her shell many years ago. These teams are much like sororities in that they teach those involved discipline, self worth, personal responsibility, teamwork and humbling humiliation. But more importantly, your child can build life-long friendships with these organizations.
Cheer and dance is a huge commitment that involves both the child and the parent. But believe me it is well worth it. During my years as a cheer mom we have traveled all over the country attending many regional, state and national competitions. Win or loose, my daughters would never trade the friendships of the experiences during this period in their lives. Now adults, my girls continue to teach young women the art of cheer and dance and I couldn't be prouder.
Below I've listed some websites you might find helpful. Please take a look at them with your daughter and husband and hopefully she'll find an activity she likes and have oodles of friends.
http://www.cmtsj.org/
http://www.wgct.org/
http://www.cheergyms.com/
http://www.nceallstars.com/
http://wsjstorm.com/
Good Luck!!!
CM