I am still of the strong opinion that the uncle wilfully received the money and is telling a lot of porkies.
Iain is right, they seem to think that UK people have an inexhaustible supply of money at their disposal, and if you are not careful you might be treated as a personal ATM machine.
I am sure that your Girl is the innocent party in this, and just a victim of her uncles greed. But confrontation will cause huge family rifts, and you have to be very diplomatic.
Good luck mate