Although it is not clear from the information that you provide, I suspect that your friend's bone cancer is probably due to her breast cancer sperading to her bones.
Sepsis does not cause bone cancer.
I am not sure that I understand your question about "mri with metal implant burn her insides," unfortunately.
As for her pain, if it is due to the cancer in her spine, she should be seen by a radiation oncologist to consider radiation treatment to her spine (if she has any weakness or numbness from nerve injury caused by the cancer in her spine, then she may also need to be seen by a spine surgeon).
Sincerely/ Robert A. Wascher, MD, FACS
www.doctorwascher.com
www.oncoguard.com