Edfund wont accept payments of 120 months....you might have have been set up for rehab but your loan wont stay with edfund long term
getting your taxes back depends on when you entered into repayment on the default and the individual guarantor.
$57 also seems low for a $6000 balance but I guess that depends on your interest rate. You had a variable rate loan so you should be at 6.8% so for a 10 year term your payment would be $69.02 according to the calculators.