I am sorry about your sister.
there are proper ways of treating and curing cervical cancer.
she needed 5 weeks of radiation therapy daily to 45Gy to the whole pelvis combined with cisplatin chemotherapy weekly.
if she has blockage of her kidneys from the cervical cancer, she would benefit from bilateral nephrostomy tubes so the urine can drain out of your back and continue to function.
after this 5 weeks of radiation is done, she needs HDR high dose rate intravaginal brachytherapy to the areas of cancer in her cervix and vaginal wall again with cisplatin chemotherapy.
this will give her her best chance for cure.
further treatments after this can be difficult if she continues to have cervical cancer
she may be cured by an aggressive surgery called an anterior exenteration which cuts out her vagina, bladder, cervix and uterus in a large aggressive surgery.
let me know if you have questions.