She was stealing checks from her friends, cash from her parents and Grandma, using their charge cards too. She may of been getting money from her boyfriends, who knows?
It was never discussed, but I wonder if she was getting any government assistance too?
For 2 + years though? I know she stole a checkbook from that girlfriend of hers and had a shopping spree at Target. It doesn;t take people 2 years to figure out that she would be stealing from them.