How forceful should I be?

My mother has dementia -- major paranoia. She will not let me in her home anymore--she thinks I'm stealing from her. She has had care-givers (that I arranged for behind the scenes) in her home for about two weeks and she trusts them. Today they are taking her to get a doctor's assessment (if they can get her to leave the house!). My mother doesn't know I'm involved, but I will meet with the doctor afterwards to discuss the assessment. While she is seeing the doctor this would give me the opportunity to go into her home and take the legal documents (POA, financial, etc) that I need to move forward with a care plan. The care givers say I should NOT enter the house and take her things, that she would lose trust in them and make their jobs harder, if not impossible. I'm between a rock and a hard place. I need the legal documents. Any advice?