I think your mother must have a cancer care team and should have been given a number to contact rather than being left in limbo. You need to get on to the hospital where she was treated and ask them the questions you are concerned about. The radiotherapy will continue to work for some time but she needs to be told when she can expect a follow up appointment and at what point they will call her or write with an appointment. I don't think her GP would be any use except for other minor problems. Your message actually upset me to. think of what you and your mother are coping with. Check out the hospital website for contact numbers if you don't have any and call or email or both. You are your mother's advocate. She deserves to be heard. Good luck.

I can only agree with everything Maire has said.

Sometimes mistakes are made and follow up appointments aren't booked. Whoever did the procedure will need to know whether it worked or not too. A follow up scan after a number of days or weeks is usually set up routinely.

This has happened to me on more than one occasion - I usually ring the hospital switchboard and ask to speak to my Oncologist's /surgeon's medical secretary then explain my situation and ask her to sort it out. 

Don't be shy - your Mum has a right to proper treatment regardless of her age and if this isn't delivered they are failing in their legal and moral duty of care.

Best wishes
Dave