Does anyone know the answer to this?

My husband's mother has dementia (taking memantine and donepezil for several years now). She cannot be without direct supervision of her husband, who has multiple physical health issues. We are considering that my husband should establish guardianships/conservatorships/health care POA, etc. in the event we need to move her to our state (they live in midwest, we are in the deep south). Because no one has ever told her that she has dementia (they say it would hurt her feelings; she thinks her medicines are vitamins), she supposedly doesn't know why she cannot drive, cook, bathe, choose her clothes, etc. So, if she were to sign guardianship/conservatorship/POA papers, would she not need to be told WHY? If not, do we really have informed consent? If we have no informed consent, would any respectable attorney let her sign them? If her spouse dies, would she become a ward of whatever state they were visiting at that time (they travel some) or of her state if he dies at home? Would we have no ability to move her to live with us? Additional thoughts are welcome as well.