Student Loans Wife is Co-Signer on Son's Loans, but She Never Signed

Our son went to an expensive private university 10 years ago and we filled out the FAFSA forms every year. My wife co-signed a student loan for $15,000 that was an American Education Services loan, we know she signed the promissory note, I was there when she signed and we know and accept that loan. But 6 months after our son graduated, we started getting threatening phone calls saying my wife was co-signer for 4 Sallie Mae loans totaling about $50,000. We are both well into our sixties, and have been paying those loans, even though it means we have to collect bottles and cans to make enough money to get through the month. My wife is going to leave her job and start collecting social security in a few months, the monthly payment for the loans will be about 60% of her social security check. We finally received copies of the promissory notes from Navient, who now has the Sallie Mae loans. Her signature is not on the Sallie Mae promissory notes, just her name typed into the line that should have her signature. We never got copies of the loan agreements and amounts and these copies don't have any amount of the loan, it just looks like an application with all our financial information. But no signatures, we would have never signed a loan without knowing what the amount was!

What do we need to do to get her name off the loan that she never signed to begin with!! Our son does not work and has never been able to help with any payments, so that avenue is a dead end.

Any help as to where to start would be appreciated.

Thomas

Student Loans Wife is Co-Signer on Son's Loans, but She Never Signed