Discrepancy on death certificate?

This question has unsettled me for several years. My grandmother ped away after suffering from Alzheimer's. There was lots of family drama during her illness. My aunts (literally evil twins) took and sold all her furniture, took credit cards out in her name, tried to submit forged prescriptions, etc. All of that has ped, and we've moved on. However, my sisters and I are still wondering why, on our grandmother's death certificate, it states cervical cancer as the cause of death. My grandmother had a hysterectomy at age 37. (Not known if her cervix even existed at time of death) We suspect that with our 2 aunt's access to the medical field, (former nurses, both of them, busted for theft), if they somehow benefited medication wise by, somewhere along the lin,e stating she had cancer. Advice?