you are not mean asking this question. mentally ill people thrive on structure just as much as anybody else. you need to be attentive to your own needs when taking care of others or else you become resentful and angry. just because she is delusional doesnt mean she cant follow rules. it may be more difficult for her if her delusion conflicts with the rule, such as she may be getting the mail every day because she is looking for the money that is coming to her. but telling her certain spaces are off limits shouldnt conflict with her delusions. like she should have no reason to go into your bedroom. if she is looking for something, she can ask instead of searching for it on her own. having a family meeting to come up with solutions to this privacy matter would make it feel like she was part of making the rules rather than having them imposed upon her.