She is very combative, has been recently diagnosed with lung cancer and refuses to let us talk to her doctors. We believe she may have been diagnosed with dementia over a year ago. She cannot get along with any caregivers and will not let us help her. She is trusting strangers over her family and shutting my brother and I out from obtaining any information. We are certain she has it, but she refuses to go for a test and let us know the results are. We've tried to talk to her and she tells us we are "sick" and need help. What do we do?