Unable to regi the property due to unwillingness of the property owner

Hi, We need to sell our ancestoral house which is in our village and it is in our grandmothers name. Since my grandma is 95years old she is unable to come to the registration office to complete the registration process. And that register office is nearly 75km away from my grandma residing village. We explained this to the sub registrar in the register office. But they said they cant do anything without my grandma come directly to the register office. My grandma is ready to give signature for the documents that are needed to sell the property from her home where she currently resides. Can anything be done legally apart from taking my grandma to the registration office. Any advice on this highly appreciated. Thank you.