Hi welcome to Health care magic forum, most probably she must be 3rd stage and require only conservative treatment. Any how it is a inabsensio openion. I advise you to have a frank discussion with your doctors regarding her condition. if they are not cooperative take second advise of an oncologist
Try to give her green leafy vegetables pulses egg milk fruits and juices which are rich in anti oxidants vitamins
necessory for repair grouth of tissues and welbeing.
Wishing for a quick recovery of your mothers health. thanks for calling.