Maybe good, calm lessons on the value of money, how it is earned, how it multiplies when invested, and how important savings are, as well as the adverse lesson on creating debt and long term consequences of stealing would help her have a more responsible understanding.
The chore chart idea is great. I got my own "checking account" when I was about her age, that encouraged me to learn how to record my expenses on the transaction register, and how to understand that I couldn't spend when funds were low. With my own allowance that I recorded my intake and expenditures, I made wiser choices and thought more closely about items that I purchased.
Perhaps helping her learn this, as well as some more modified counseling for her behaviour as the other moms suggested may help for the stealing, coupled with the trouble she has with making friends, can be part of a larger problem.
Here are some helpful links:
http://www.kidshealth.org/parent/emotions/behavior/shopli...
http://www.parenting-ed.org/handout3/Specific%20Concerns%...
http://www.familyresource.com/parenting/behavior-issues/w...
Lessons, I believe on her own personal value and worth, and the meaning of true friends, who don't judge because of money can help. Perhaps getting her involved in some activites or programs with new girls can help give her a fresh start and confidence.(Cheer, gymnastics, dance, soccer, cooking classes, arts/crafts, church group, Tae Kwon Do...) I love this quote:
"If young women know of God's love for them, it will influence and shape all of their thoughts, feelings, and actions. They will understand they have a mission to perform in this life. They will have confidence in their ability to make responsible, righteous decisions. They will be able to resist temptation, to flee from worldly things, to dress modestly as is becoming of a divine daughter of God."
—Susan W. Tanner, Young Women general president
http://www.lds.org/pa/display/0,17884,6822-1,00.html