If this check was deposited into the account in which the check was made out, ie; check made to jane doe, deposited to jane does account. Guess what, Jane Doe got benefit from the check. Is the money still in her account? If so take it back and pay your returned check. If it is not in her account then she used the money. You can prove that you deposited this check into her account. Either she signs the check or she owes the bank $3,000. Friendship aside, thats the bottom line. Does she want to sign the check and owe the lending company $3,000 (they should have loan documents on file with her signature, is she saying these are forged???) or does she want the bank to charge her account back for the money and owe the bank?