Perhaps she was faking being alive
Barb's brain has more calcium deposits than a bottle of whole milk and more holes than a Jack the Ripper victim. She is absolutely incapable of giving consent to either sex or financial transactions. Money, being a form of financial capital since we live in a society, is property. Chris was specifically restricted by this order from touching any of Barb's bank accounts, i.e., her property. At this point, it doesn't matter if Barb says "I gave him permission"; the fact is that he violated a binding legal restriction issued specifically against him by the state of Virginia.