1. A mortgaged property can be sold or dealt with in any manner without the written consent of the mortgagee.
2. While creating the mortgage, the original Title Deed is required to be deposited with the Mortgagee Bank and without such deposit there is no mortgage of the said property.
3. So, the case stands as that your mother had availed an unsecured loan wherein her property was not mortgaged with the lending Bank.
4. She had sold her property during her lifetime from where her medical expenditure was met. You can ot legally sell her property during her lifetime which indicates that she had sold her property.
5. You are not liable to pay the loan taken by your deceased mother unless you have inherited property from her having value equal to the outstanding amount i.e. your liability to your mother's outstanding loan amount will be limited to the value of the property you have inherited from her.
6. The buyer of the said property also is in no way responsible or liable to pay the liability of your mother, if he has collect the original title Deed of your mother while buying the said property.