Funds for minors attorney

This is a funding request to help pay the balance owed for my minor daughter attorney that was court appointed during my custody case. I was awarded sole physical custody. I have already paid $1,075 to her attorney and still owe $2,100. I have been making regular monthly payments but just received a letter that I need to pay the balance in full immediately since our custody case is now finished. This not something I can do on my own and I am desperate for additional help. Anything helps.