My Mother refuses to see any doctor and her dementia is undiagnosed. What can I do?

She can still move around but is losing reality. She is 72 and is experiencing dementia or aggravation of schizophrenia or similar that have gone undiagnosed for many years due to her refusal to see a doctor of any kind. This is now combined with onset of physical issues including frequent infections, absesses, limping, loss of eye sight, skin contusions. She seems to function daily as she lives alone, but will not leave the house. No medication is accepted. She continues to insist that she has no medical or mental issues despite obvious physical character issues. We would like to see her forced to get a full medical examination and diagnoses of the reasons for the limps and also a large growth that is on her cranium. Other smaller growths continue to appear. Any help is appreciated.